Nearby EIGRP falls on GRE tunnel

I have several users working at home with a router 871 a 2811 access in our offices. While most of these connections works without any problem, I have a few sites that continue to drop the EIGRP neighbor. Here is a sample of the log file

* Dec 17 06:32:48: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is on the rise: new adjacency

* Dec 17 06:41:58: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is falling: Farewell Interface received

* Dec 17 06:42:03: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is on the rise: new adjacency

* Dec 17 06:43:41: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is falling: Farewell Interface received

* Dec 17 06:43:46: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is on the rise: new adjacency

* Dec 17 06:49:30: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is falling: Farewell Interface received

* Dec 17 06:49:33: % DUAL-5-NBRCHANGE: 10 IP-EIGRP (0): neighbor 172.29.1.49 (Tunnel1) is on the rise: new adjacency

Does anyone have any ideas as to what may cause this problem?

Rick

Run us EIGRP GRE/IPSec tunnels to many remote routers. We have seen this problem of instability of EIGRP neighbor, more in some areas and less in others. Often one side removes the neighbor relationship and sends a 'goodby' neighbor. I guess it must if with packet loss drop some of the EIGRP Hello messages. We found that, by increasing the EIGRP timers, we reduced the frequency with which we see the problem (we use 15 and 45 rather than the value default 5 and 15).

HTH

Rick

Tags: Cisco Security

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    Ethernet2 172.16.1.10 YES NVRAM up up
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    Tunnel201 1.3.82.62 YES NVRAM up toward the bottom<====  ="">
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    Connection-id: motor-id = 11:2 (hardware)
    74.WW 10. XX.35 208.YY. ZZ.11 ACTIVE 3des sha psk 1 23:56:09
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    #pkts not unpacked: 0, #pkts decompress failed: 0
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    current outbound SPI: 0x45047D1D (1157922077)

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    calendar of his: service life remaining (k/s) key: (4486831/1056)
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    support for replay detection: Y
    Status: ACTIVE

    the arrival ah sas:

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    outgoing esp sas:
    SPI: 0x45047D1D (1157922077)
    transform: esp-3des esp-sha-hmac.
    running parameters = {Tunnel}
    Conn ID: 2003, flow_id: C83X_MBRD:3, crypto card: IPVPN_MAP
    calendar of his: service life remaining (k/s) key: (4486744/1056)
    Size IV: 8 bytes
    support for replay detection: Y
    Status: ACTIVE

    outgoing ah sas:

    outgoing CFP sas:

    protégé of the vrf: (none)
    ident (addr, mask, prot, port) local: (74.WW. XX.35/255.255.255.255/47/0)
    Remote ident (addr, mask, prot, port): (208.XX. YY.11/255.255.255.255/47/0)
    current_peer 208.XX. YY.11 port 500
    LICENCE, flags is {origin_is_acl},
    #pkts program: 2333, #pkts encrypt: 2333, #pkts digest: 2333
    #pkts decaps: 0, #pkts decrypt: 0, #pkts check: 0
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 0, #pkts compr. has failed: 0
    #pkts not unpacked: 0, #pkts decompress failed: 0
    #send 21, #recv errors 0

    local crypto endpt. : 74.WW. XX.35, remote Start crypto. : 208.XX. YY.11
    Path mtu 1500, mtu 1500 ip, ip mtu IDB Ethernet1
    current outbound SPI: 0xE82A86BC (3895101116)

    SAS of the esp on arrival:
    SPI: 0x539697CA (1402378186)
    transform: esp-3des esp-sha-hmac.
    running parameters = {Tunnel}
    Conn ID: 2008, flow_id: C83X_MBRD:8, crypto card: IPVPN_MAP
    calendar of his: service life remaining (k/s) key: (4432595/1039)
    Size IV: 8 bytes
    support for replay detection: Y
    Status: ACTIVE

    the arrival ah sas:

    SAS of the CFP on arrival:

    outgoing esp sas:
    SPI: 0xE82A86BC (3895101116)
    transform: esp-3des esp-sha-hmac.
    running parameters = {Tunnel}
    Conn ID: 2001, flow_id: C83X_MBRD:1, crypto card: IPVPN_MAP
    calendar of his: service life remaining (k/s) key: (4432508/1039)
    Size IV: 8 bytes
    support for replay detection: Y
    Status: ACTIVE

    outgoing ah sas:

    outgoing CFP sas:
    Site-382-831 #.

    Site-382-831 #.
    Site-382-831 #show crypto ipsec his | Pkts Inc. | life
    #pkts program: 2397, #pkts encrypt: 2397, #pkts digest: 2397
    #pkts decaps: 0, #pkts decrypt: 0, #pkts check: 0
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 0, #pkts compr. has failed: 0
    #pkts not unpacked: 0, #pkts decompress failed: 0
    calendar of his: service life remaining (k/s) key: (4486831/862)
    calendar of his: service life remaining (k/s) key: (4486738/862)
    #pkts program: 2397, #pkts encrypt: 2397, #pkts digest: 2397
    #pkts decaps: 0, #pkts decrypt: 0, #pkts check: 0
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 0, #pkts compr. has failed: 0
    #pkts not unpacked: 0, #pkts decompress failed: 0
    calendar of his: service life remaining (k/s) key: (4432595/846)
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    authentication method: pre-shared Key
    Diffie-Hellman group: #1 (768 bits)
    lifetime: 86400 seconds, no volume limit
    Default protection suite
    encryption algorithm: - Data Encryption STANDARD (56-bit keys).
    hash algorithm: Secure Hash Standard
    authentication method: Rivest-Shamir-Adleman Signature
    Diffie-Hellman group: #1 (768 bits)
    lifetime: 86400 seconds, no volume limit
    Site-382-831 #.

    Site-382-831 #show crypto card
    "IPVPN_MAP" 101-isakmp ipsec crypto map
    Description: at the 2nd KC BGP 2821 - PRI - B
    Peer = 208.YY. ZZ.11
    Extend the PRI - B IP access list
    access list PRI - B allowed will host 74.WW. XX.35 the host 208.YY. ZZ.11
    Current counterpart: 208.YY. ZZ.11
    Life safety association: 4608000 Kbytes / 3600 seconds
    PFS (Y/N): N
    Transform sets = {}
    IPVPN,
    }

    "IPVPN_MAP" 201-isakmp ipsec crypto map
    Description: 2nd Dallas BGP 2821 - s-B
    Peer = 208.XX. YY.11
    Expand the list of IP SEC-B access
    s - B allowed will host 74.WW access list. XX.35 the host 208.XX. YY.11
    Current counterpart: 208.XX. YY.11
    Life safety association: 4608000 Kbytes / 3600 seconds
    PFS (Y/N): N
    Transform sets = {}
    IPVPN,
    }
    Interfaces using crypto card IPVPN_MAP:
    Ethernet1
    Site-382-831 #.

    Tunnel between KC & the remote site configuration is:

    Distance c831 - KC

    crypto ISAKMP policy 10
    BA 3des
    preshared authentication
    !
    PRI-B-382 address 208.YY isakmp encryption key. ZZ.11
    !
    Crypto ipsec transform-set esp-3des esp-sha-hmac IPVPN
    transport mode
    !
    IPVPN_MAP 101 ipsec-isakmp crypto map
    Description of 2nd KC BGP 2821 - PRI - B
    set of peer 208.YY. ZZ.11
    game of transformation-IPVPN
    match address PRI - B
    !
    interface Tunnel101
    Description % connected to the 2nd KC BGP 2821 - PRI - B
    IP 1.3.82.46 255.255.255.252
    IP mtu 1500
    KeepAlive 3 3
    IP virtual-reassembly
    IP tcp adjust-mss 1360
    source of tunnel Ethernet1
    destination of the 208.YY tunnel. ZZ.11
    !
    interface Ethernet0
    private network Description
    IP 10.3.82.10 255.255.255.0
    IP mtu 1500
    no downtime
    !
    interface Ethernet1
    IP 74.WW. XX.35 255.255.255.248
    IP mtu 1500
    automatic duplex
    IP virtual-reassembly
    card crypto IPVPN_MAP
    no downtime
    !
    PRI - B extended IP access list
    allow accord 74.WW the host. XX.35 the host 208.YY. ZZ.11
    !

    KC-2821 *.

    PRI-B-382 address 74.WW isakmp encryption key. XX.35
    !
    PRI-B-382 extended IP access list
    allow accord 208.YY the host. ZZ.11 the host 74.WW. XX.35
    !
    IPVPN_MAP 382 ipsec-isakmp crypto map
    Description % connected to the 2nd KC BGP 2821
    set of peer 74.WW. XX.35
    game of transformation-IPVPN
    match address PRI-B-382
    !
    interface Tunnel382
    Description %.
    IP 1.3.82.45 255.255.255.252
    KeepAlive 3 3
    IP virtual-reassembly
    IP tcp adjust-mss 1360
    IP 1400 MTU
    delay of 40000
    tunnel of 208.YY origin. ZZ.11
    destination of the 74.WW tunnel. XX.35
    !
    end

    Any help would be much appreciated!

    Mark

    Hello

    logs on Site-382-831, only see the crypt but none decrypts, could you check a corresponding entry on the peer and see if has any questions send return traffic?

    Site-382-831 #show crypto ipsec his | Pkts Inc. | life
    #pkts program: 2397, #pkts encrypt: 2397, #pkts digest: 2397
    #pkts decaps: 0, #pkts decrypt: 0, #pkts check: 0
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 0, #pkts compr. has failed: 0
    #pkts not unpacked: 0, #pkts decompress failed: 0
    calendar of his: service life remaining (k/s) key: (4486831/862)
    calendar of his: service life remaining (k/s) key: (4486738/862)
    #pkts program: 2397, #pkts encrypt: 2397, #pkts digest: 2397
    #pkts decaps: 0, #pkts decrypt: 0, #pkts check: 0
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 0, #pkts compr. has failed: 0
    #pkts not unpacked: 0, #pkts decompress failed: 0
    calendar of his: service life remaining (k/s) key: (4432595/846)
    calendar of his: service life remaining (k/s) key: (4432501/846)
    Site-382-831 #.

    Kind regards

    Averroès.

  • NAT &amp; GRE Tunnel

    Hello

    I have a test installation routers 2 with a GRE tunnel which works very well in the test configuration. My question is if I transfer this config for direct mounting how I would exempt traffic over the tunnel WILL be natted? Everything else is the traffic destined for the internet should be tapped to the external interface. Would need a road map for this?

    Thank you

    R1

    --

    interface Tunnel0

    IP 192.168.200.2 255.255.255.0

    dissemination of IP ospf network

    KeepAlive 10 3

    source of tunnel FastEthernet0

    tunnel destination 1.1.1.1

    crypto mymap map

    interface FastEthernet0

    Outside of the Interface Description

    1.1.1.2 IP 255.255.255.0

    automatic speed

    crypto mymap map

    R2

    --

    Tunnel1 interface

    192.168.200.1 IP address 255.255.255.0

    dissemination of IP ospf network

    KeepAlive 10 3

    source of tunnel FastEthernet0

    tunnel destination 1.1.1.2

    crypto mymap map

    interface FastEthernet0

    Outside of the Interface Description

    IP 1.1.1.1 255.255.255.0

    automatic speed

    crypto mymap map

    Yes you are right.

  • Significant decline in performance on the GRE tunnel after using cryptographic protection

    Hi all

    I have two G1 RSR (1811 and 1812) who have a GRE tunnel between them.

    Without any encryption protection I received about 3.6 MB/s in regular transfers of Windows SMB. After using cryptographic protection of the tunnel I'm now only 2.7 MB/s transfers of same.

    No idea as to why this is?

    My conclusions:
    According to this http://www.cisco.com/web/partners/downloads/765/tools/quickreference/vpn... the AES crypto fixed return of the 1800s is 40 MB/s.
    The increase in overhead of cryptographic protection shouldn't be the problem I tried to test the transfers on the tunnel without protection and 'ip tcp adjust-mss 800' of the tunnel. There was only a small performance drop here, not as much as with the crypto.
    I tried several sets of cryptographic transformation, they all give the same performance as long as they are made in the material.
    ISAKMP is always done in the software? I can't get it to show its is done at the hardware level, regardless of isakmp policy.

    IP MTU on both interfaces of tunnel are 1434 with cryptographic protection.

    My config:

    crypto ISAKMP policy 10
    BA aes 256
    sha512 hash
    preshared authentication
    Group 20
    isakmp encryption key * address *.
    !
    Crypto ipsec transform-set ESP-AES256-SHA esp - aes 256 esp-sha-hmac
    transport mode
    !
    Profile of crypto ipsec VPN
    game of transformation-ESP-AES256-SHA
    !
    Tunnel10
    IP 10.251.251.1 255.255.255.0
    no ip redirection
    no ip proxy-arp
    load-interval 30
    source of tunnel FastEthernet0
    tunnel destination *.
    tunnel path-mtu-discovery
    Tunnel VPN ipsec protection profile
    !

    Output:

    ISR1811 #sh crypto ipsec his
    Interface: Tunnel10
    Tag crypto map: addr Tunnel10-head-0, local *.

    protégé of the vrf: (none)
    ident (addr, mask, prot, port) local: (* / 255.255.255.255/47/0)
    Remote ident (addr, mask, prot, port): (* / 255.255.255.255/47/0)
    current_peer * port 500
    LICENCE, flags is {origin_is_acl},
    #pkts program: 683060, #pkts encrypt: 683060, #pkts digest: 683060
    #pkts decaps: 1227247, #pkts decrypt: 1227247, #pkts check: 1227247
    compressed #pkts: 0, unzipped #pkts: 0
    #pkts uncompressed: 0, #pkts compr. has failed: 0
    #pkts not unpacked: 0, #pkts decompress failed: 0
    Errors #send 0, #recv 0 errors

    endpt local crypto. : *, remote Start crypto. : ***
    Path mtu 1500, mtu 1500 ip, ip mtu IDB FastEthernet0
    current outbound SPI: 0x8D9A911E (2375717150)
    PFS (Y/N): N, Diffie-Hellman group: no

    SAS of the esp on arrival:
    SPI: 0xD6F42959 (3606325593)
    transform: aes-256-esp esp-sha-hmac.
    running parameters = {Transport}
    Conn ID: 45, flow_id: VPN on board: 45, sibling_flags 80000006, crypto card: head-Tunnel10-0
    calendar of his: service life remaining (k/s) key: (4563208/1061)
    Size IV: 16 bytes
    support for replay detection: Y
    Status: ACTIVE

    the arrival ah sas:
    SAS of the CFP on arrival:

    outgoing esp sas:
    SPI: 0x8D9A911E (2375717150)
    transform: aes-256-esp esp-sha-hmac.
    running parameters = {Transport}
    Conn ID: 46, flow_id: VPN on board: 46, sibling_flags 80000006, crypto card: head-Tunnel10-0
    calendar of his: service life remaining (k/s) key: (4563239/1061)
    Size IV: 16 bytes
    support for replay detection: Y
    Status: ACTIVE

    outgoing ah sas:
    outgoing CFP sas:

    ISR1811 #show in detail his crypto isakmp
    Code: C - IKE configuration mode, D - Dead Peer Detection
    NAT-traversal - KeepAlive, N - K
    T - cTCP encapsulation, X - IKE Extended Authentication
    PSK - GIPR pre-shared key - RSA signature
    renc - RSA encryption
    IPv4 Crypto ISAKMP Security Association

    C - id Local Remote I have VRF status BA hash Auth DH lifetime limit.
    2015 * * ACTIVE aes sha5 psk 20 12:42:50
    Engine-id: Conn-id = SW: 15
    2016 * * ACTIVE aes sha5 psk 20 12:42:58
    Engine-id: Conn-id = SW: 16
    IPv6 Crypto ISAKMP Security Association

    Use of CPU for the transfer with crypto:

    ISR1811 #sh proc cpu its

    ISR1811 09:19:54 Tuesday Sep 2 2014 THIS

    544444555555555544444444445555544444555556666644444555555555
    355555000001111133333888884444444444333333333377777666662222
    100
    90
    80
    70
    60                                          *****     *****
    50 ****************     **********     ************************
    40 ************************************************************
    30 ************************************************************
    20 ************************************************************
    10 ************************************************************
    0... 5... 1... 1... 2... 2... 3... 3... 4... 4... 5... 5... 6
    0 5 0 5 0 5 0 5 0 5 0
    Processor: % per second (last 60 seconds)

    ISR1812 #sh proc cpu history

    ISR1812, Tuesday 09:19:24 Sep 2 2014 THIS

    666666666666666666666666666666666666666666655555444445555544
    777888883333344444555555555566666777770000055555777776666666
    100
    90
    80
    70 ********          ********************
    60 ************************************************     *****
    50 ************************************************************
    40 ************************************************************
    30 ************************************************************
    20 ************************************************************
    10 ************************************************************
    0... 5... 1... 1... 2... 2... 3... 3... 4... 4... 5... 5... 6
    0 5 0 5 0 5 0 5 0 5 0
    Processor: % per second (last 60 seconds)

    I think that this performance is what you should get with the legacy 18xx SRI G1. But the performance degradation is perhaps really a little too high.

    For ISAKMP, there is no problem with that. The amount of protected data is too small to have one any influence.

    As a first test, I would remove the GRE encapsulation by setting "mode ipsec ipv4 tunnel" on the tunnel interface and compare if the results improve.

  • Configuration of Site VPN connection to another via GRE Tunnels

    I am trying to connect VPN site to site on the internet using GRE tunnels. I am able to reach from a WAN interface to another. But I am not able to get the ISAKMP and IPSec to work. Below the configuration and a simplified below flowchart. In the scenario below, I am also running BGP between these routers. The BGP neighbor-ships are trained through the tunnels. But I want traffic between tunnels to encrypt. IPsec and ISAKMP not running BGP routes and other traffic is not encrypted.

    This is why I would like to know what could the reason for this.

    Router config VPN 1

     crypto isakmp policy 1 encr 3des authentication pre-share group 2 lifetime 500 crypto isakmp key test_key1 address 192.168.30.1 crypto isakmp key test_key1 address 192.168.30.2 crypto isakmp keepalive 60 20 crypto isakmp aggressive-mode disable ! ! crypto ipsec transform-set high esp-3des esp-sha-hmac mode tunnel ! ! ! crypto map CRYP_MAP_IPSEC 10 ipsec-isakmp set peer 192.168.20.1 set security-association lifetime seconds 4000 set transform-set high set pfs group2 match address 110 crypto map CRYP_MAP_IPSEC 20 ipsec-isakmp set peer 192.168.20.2 set security-association lifetime seconds 4000 set transform-set high set pfs group2 match address 111 ! interface Loopback0 description IPsec_Tunnel0 ip address 192.168.30.1 255.255.255.255 ! interface Loopback1 description IPsec_Tunnel1 ip address 192.168.30.2 255.255.255.255 ! interface Loopback2 description BGP_Peer1 ip address 192.168.40.1 255.255.255.255 ! interface Loopback3 description BGP_Peer2 ip address 192.168.40.2 255.255.255.255 ! interface Tunnel0 ip unnumbered Loopback0 tunnel source Loopback0 tunnel destination 192.168.20.1 crypto map CRYP_MAP_IPSEC ! interface Tunnel1 ip unnumbered Loopback1 tunnel source Loopback1 tunnel destination 192.168.20.2 crypto map CRYP_MAP_IPSEC ! interface gi0 description #### CONNECTED TO Internet #### ip address 10.1.1.1 255.255.255.252 ip access-group 100 in duplex auto speed auto ! router bgp 64851 bgp log-neighbor-changes neighbor BGP_PEER_1 peer-group neighbor BGP_PEER_1 remote-as 64859 neighbor BGP_PEER_1 ebgp-multihop 255 neighbor BGP_PEER_1 update-source Loopback2 neighbor BGP_PEER_1 version 4 neighbor BGP_PEER_1 next-hop-self neighbor BGP_PEER_2 peer-group neighbor BGP_PEER_2 remote-as 64859 neighbor BGP_PEER_2 ebgp-multihop 255 neighbor BGP_PEER_2 update-source Loopback3 neighbor BGP_PEER_2 version 4 neighbor BGP_PEER_2 next-hop-self neighbor 192.168.10.1 peer-group BGP_PEER_1 neighbor 192.168.10.2 peer-group BGP_PEER_2 ! ip route 192.168.10.1 255.255.255.255 Tunnel0 ip route 192.168.10.2 255.255.255.255 Tunnel1 ip route 192.168.20.1 255.255.255.255 GigabitEthernet0 ip route 192.168.20.2 255.255.255.255 GigabitEthernet0 ! access-list 100 permit ip any any access-list 110 permit gre host 192.168.30.1 host 192.168.20.1 access-list 110 permit gre host 192.168.20.1 host 192.168.30.1 access-list 111 permit gre host 192.168.30.2 host 192.168.20.2 access-list 111 permit gre host 192.168.20.2 host 192.168.30.2 ======================================================================

    Router config VPN 2

     crypto isakmp policy 1 encr 3des authentication pre-share group 2 lifetime 500 crypto isakmp key test_key1 address 192.168.30.1 crypto isakmp key test_key1 address 192.168.30.2 crypto isakmp keepalive 60 20 crypto isakmp aggressive-mode disable ! ! crypto ipsec transform-set high esp-3des esp-sha-hmac mode tunnel ! ! ! crypto map CRYP_MAP_IPSEC 10 ipsec-isakmp set peer 192.168.30.1 set security-association lifetime seconds 4000 set transform-set high set pfs group2 match address 110 crypto map CRYP_MAP_IPSEC 20 ipsec-isakmp set peer 192.168.30.2 set security-association lifetime seconds 4000 set transform-set high set pfs group2 match address 111 ! interface Loopback0 description IPsec_Tunnel0 ip address 192.168.20.1 255.255.255.255 ! interface Loopback1 description IPsec_Tunnel1 ip address 192.168.20.2 255.255.255.255 ! interface Loopback2 description BGP_Peer1 ip address 192.168.10.1 255.255.255.255 ! interface Loopback3 description BGP_Peer2 ip address 192.168.10.2 255.255.255.255 ! interface Tunnel0 ip unnumbered Loopback0 tunnel source Loopback0 tunnel destination 192.168.30.1 crypto map CRYP_MAP_IPSEC ! interface Tunnel1 ip unnumbered Loopback1 tunnel source Loopback1 tunnel destination 192.168.30.2 crypto map CRYP_MAP_IPSEC ! interface gi0 description #### CONNECTED TO Internet #### ip address 10.1.1.2 255.255.255.252 ip access-group 100 in duplex auto speed auto ! router bgp 64859 bgp log-neighbor-changes neighbor BGP_PEER_1 peer-group neighbor BGP_PEER_1 remote-as 64851 neighbor BGP_PEER_1 ebgp-multihop 255 neighbor BGP_PEER_1 update-source Loopback2 neighbor BGP_PEER_1 version 4 neighbor BGP_PEER_1 next-hop-self neighbor BGP_PEER_2 peer-group neighbor BGP_PEER_2 remote-as 64851 neighbor BGP_PEER_2 ebgp-multihop 255 neighbor BGP_PEER_2 update-source Loopback3 neighbor BGP_PEER_2 version 4 neighbor BGP_PEER_2 next-hop-self neighbor 192.168.40.1 peer-group BGP_PEER_1 neighbor 192.168.40.2 peer-group BGP_PEER_2 ! ip route 192.168.40.1 255.255.255.255 Tunnel0 ip route 192.168.40.2 255.255.255.255 Tunnel1 ip route 192.168.30.1 255.255.255.255 gi0 ip route 192.168.30.2 255.255.255.255 gi0 ! access-list 100 permit ip any any access-list 110 permit gre host 192.168.20.1 host 192.168.30.1 access-list 110 permit gre host 192.168.30.1 host 192.168.20.1 access-list 111 permit gre host 192.168.20.2 host 192.168.30.2 access-list 111 permit gre host 192.168.30.2 host 192.168.20.2 ======================================================================

    Encryption of your Tunnel configuration is incorrect... you need to do something about the following at both ends.

    crypto ISAKMP policy 10
    aes encryption
    sha hash
    preshared authentication
    Group 5
     
    cisco crypto isakmp key address
     
    Crypto ipsec transform-set esp - aes 256 esp-sha-hmac RIGHT
     
    Profile of crypto ipsec MYPROFILE
    transformation-RIGHT game
     
    interface tunnel 10
    Unnumbered IP gig0/0
    tunnel source gig0/0
    tunnel destination
    ipv4 ipsec tunnel mode
    Profile of tunnel MYPROFILE ipsec protection
     

    --

    Please do not forget to select a correct answer and rate useful posts

  • An interface of multipoint GRE tunnel on two physical interfaces?

    Hi all

    I use DMVPN double single cloud VPN network of hubs.

    Our shelves (C831 SRI) are connected to the dynamic DHCP ISP and dynamic PPPoE ISP.  I want to install a temporary kit that fits anywhere.  Here is the configuration of my my ISP PPPoE tunnel:

    interface Tunnel0
    bandwidth 1000
    IP 172.23.2.254 255.255.252.0
    no ip redirection
    IP mtu 1436
    property intellectual PNDH authentication xxxxxx
    map of PNDH 172.16.0.1 IP 230.2.2.1

    map of PNDH IP multicast 230.2.2.1
    map of PNDH 172.16.0.2 IP 230.2.2.2
    map of PNDH IP multicast 230.2.2.1
    PNDH id network IP-900001
    property intellectual PNDH holdtime 300
    property intellectual PNDH nhs 172.16.0.1
    property intellectual PNDH nhs 172.16.0.2
    delay of 1000
    source of Dialer1 tunnel
    multipoint gre tunnel mode
    tunnel key xxxxxx
    Tunnel MyIPSecProf ipsec protection profile

    For my ISP DHCP, I only change the Ethernet1 tunnel source.

    Is it possible to configure tunnel interfaces different related 2 on 2 physical interfaces (like: 1 Ethernet1 and 1 in Dialer1).  The challenge is that I can not change the configuration of hubs at all.  So I can't put the ip address of the tunnel in 2 different subnet.  There is only 1 tunnel on the hub interface

    Someone has an idea?

    Thank you very much

    Yes, I see it now. Unnumbered IP will provide the interface to the MTR and tunnel interface you have is point-to-multipoint. I'm afraid that there is no good solution to your needs.

    Kind regards

    Lei Tian

  • GRE tunnel

    Hi - I'm trying to understand how the network described in the configuration http://pastebin.com/fM40vxcG is structured. I'm fighting for work on how I am connected to 10.144.254.1 before building a gre tunnel by using the node as a tunnel destination. Thank you very much

    concerning

    Vladimir

    Hello Vladimir,.

    I checked your link.

    I was you I wouldn't stick my Pwd VPN on a public forum, which is not really sure (unless you used a collar). If this isn't the case, you can edit your post and point to another link with pw stripped and can change the public ip addresses as well.

    Regarding your configuration, you have an encryption card configured with an ACL that match the tunnel.

    So in the end, your GRE tunnel using the private IP address is encapsulated in an IPSEC Tunnel using public IPS (see set crypto map peer): then you have a tunnel tunnel.

    I can't tell you the object of this since I do not know your topology.

    Hope this helps,

    Bastien.

  • Package and drop on GRE tunnel CPU high usage

    Hello world

    We have GRE tunnel between 2 sites.

    Users have complained about the slow pace and I checked the CPU usage is too high.

    She went from 40-70% on average in the last hours.

    Here is the setting of the tunnel interface

    MTU 17916 bytes, BW 100 Kbit, DLY 50000 usec,

    reliability 255/255, txload 235/255, rxload 241/255

    Input queue: 0, 75, 4339, 0 (size/max/drops/dumps); Total output drops: 89

    Other end has 39 drops

    Is it ok to have drops when there is large amount of traffic through the tunnel of?.

    Need to know what I should look for?

    Are these drops 89 ok to have?

    Thank you

    MAhesh

    Hello Manu,

    If this is not yet a subject that would be close to me, but I'll have a try.

    What model device you use on the site where you use an observer the CPU high? Maybe the device cannot handle the amount of traffic using this method?

    Can you post any output of the command "show interface Tunnel x"?

    What type of connection WAN this GRE Tunnel use?

    Is the bandwidth on what whether failure 8000 kbps both inside and outside?

    I think that you can configure by using the commands

    "transmission of bandwidth of tunnel.

    "bandwidth tunnel receive."

    There also a command

    "bandwidth".

    What you use this connection for, were there changes in the use of network between sites that would explain the increased use of the processor?

    It seems according to the output above the Tunnel is simply "push and in" as much traffic as possible. Or as much traffic it can push accoring to the configuration of the interface.

    txload 235/255, rxload 241/255

    This coupled with high CPU usage could explain naturally drops. Although of course, the CPU usage is probably the effect of the use of the tunnel bandwidth.

    -Jouni

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