LAN-to-LAN tunnel between VPN 3000 and Cisco 1721
Hello
I have a current LAN-to-LAN tunnel configuration between VPN 3000 (3.6) and Cisco 1721 (12.2 (11) T).
When I use the encryption = authentication and Des-56 = ESP\MD5\HMAC-128 for the IPSec Security Association, everything works fine.
However, I would like to Turn off encryption for some time getting the speed improvements, so I changed
Encryption = null esp (in 1721) and to "null" in VPN-3000.
Now the tunnel is setup but I can spend only ICMP traffic. When I pass the traffic UDP\TCP the message below appears the Cisco 1721
% C1700_EM-1-ERROR: error in packet-rx: pad size error, id 75, hen offset 0
Has anyone seen this behavior?
All those put in place an IPSec Tunnel with only the ESP authentication and NO encryption between VPN-3000 and Cisco 1721?
Thanx------Naman
Naman,
Disable you the vpn Accelerator? "no accel crypto engine. Sure that you can't do with a null module vpn.
Kurtis Durrett
Tags: Cisco Security
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Hi guys,.
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Hi all!
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Debugging is followed:
14:47:51.755 on 21 oct: PPP: Alloc context [294C7BC4]
14:47:51.755 on 21 oct: ppp98 PPP: Phase is
14:47:51.755 on 21 oct: ppp98 PPP: using AAA Id Unique = 8 b
14:47:51.755 on 21 oct: ppp98 PPP: permission NOT required
14:47:51.755 on 21 oct: ppp98 PPP: via vpn, set the direction of the call
14:47:51.755 on 21 oct: ppp98 PPP: treatment of connection as a callin
14:47:51.755 on 21 oct: ppp98 PPP: Session Session handle [62] id [98]
14:47:51.755 on 21 oct: ppp98 TPIF: State of the event [OPEN] [initial check]
14:47:51.755 on 21 oct: ppp98 PPP LCP: switch to passive mode, State [stopped]
14:47:53.759 on 21 oct: ppp98 PPP LCP: exit passive mode, State [departure]
14:47:53.759 on 21 oct: LCP ppp98: O CONFREQ [departure] id 1 len 19
14:47:53.759 on 21 oct: ppp98 TPIF: MRU 1464 (0x010405B8)
14:47:53.759 on 21 oct: ppp98 TPIF: AuthProto MS-CHAP-V2 (0x0305C22381)
14:47:53.759 on 21 oct: ppp98 TPIF: MagicNumber 0xF018D237 (0x0506F018D237)
14:47:53.759 on 21 oct: ppp98 TPIF: event [UP] State [departure at REQsent]
14:47:54.351 on 21 oct: ppp98 TPIF: I CONFREQ [REQsent] id 0 len 18
14:47:54.351 on 21 oct: ppp98 TPIF: MRU 1400 (0 x 01040578)
14:47:54.351 on 21 oct: ppp98 TPIF: MagicNumber 0x2F7C5F7E (0x05062F7C5F7E)
14:47:54.351 on 21 oct: ppp98 TPIF: PFC (0 x 0702)
14:47:54.351 on 21 oct: ppp98 TPIF: RAC (0 x 0802)
14:47:54.351 on 21 oct: LCP ppp98: O CONFNAK [REQsent] id 0 len 8
14:47:54.351 on 21 oct: ppp98 TPIF: MRU 1464 (0x010405B8)
14:47:54.351 on 21 oct: ppp98 TPIF: State of the event [receive ConfReq-] [REQsent to REQsent]
14:47:54.751 on 21 oct: ppp98 TPIF: I CONFACK [REQsent] id 1 len 19
14:47:54.751 on 21 oct: ppp98 TPIF: MRU 1464 (0x010405B8)
14:47:54.751 on 21 oct: ppp98 TPIF: AuthProto MS-CHAP-V2 (0x0305C22381)
14:47:54.751 on 21 oct: ppp98 TPIF: MagicNumber 0xF018D237 (0x0506F018D237)
14:47:54.751 on 21 oct: ppp98 TPIF: State of the event [receive ConfAck] [REQsent to ACKrcvd]
14:47:54.915 on 21 oct: ppp98 TPIF: I CONFREQ [ACKrcvd] id 1 len 18
14:47:54.915 on 21 oct: ppp98 TPIF: MRU 1400 (0 x 01040578)
14:47:54.915 on 21 oct: ppp98 TPIF: MagicNumber 0x2F7C5F7E (0x05062F7C5F7E)
14:47:54.915 on 21 oct: ppp98 TPIF: PFC (0 x 0702)
14:47:54.915 on 21 oct: ppp98 TPIF: RAC (0 x 0802)
14:47:54.915 on 21 oct: LCP ppp98: O CONFNAK [ACKrcvd] id 1 len 8
14:47:54.915 on 21 oct: ppp98 TPIF: MRU 1464 (0x010405B8)
14:47:54.915 on 21 oct: ppp98 TPIF: State of the event [receive ConfReq-] [ACKrcvd to ACKrcvd]
14:47:55.275 on 21 oct: ppp98 TPIF: I CONFREQ [ACKrcvd] id 2 len 18
14:47:55.275 on 21 oct: ppp98 TPIF: MRU 1464 (0x010405B8)
14:47:55.275 on 21 oct: ppp98 TPIF: MagicNumber 0x2F7C5F7E (0x05062F7C5F7E)
14:47:55.275 on 21 oct: ppp98 TPIF: PFC (0 x 0702)
14:47:55.275 on 21 oct: ppp98 TPIF: RAC (0 x 0802)
14:47:55.275 on 21 oct: LCP ppp98: O CONFACK [ACKrcvd] id 2 len 18
14:47:55.275 on 21 oct: ppp98 TPIF: MRU 1464 (0x010405B8)
14:47:55.275 on 21 oct: ppp98 TPIF: MagicNumber 0x2F7C5F7E (0x05062F7C5F7E)
14:47:55.275 on 21 oct: ppp98 TPIF: PFC (0 x 0702)
14:47:55.275 on 21 oct: ppp98 TPIF: RAC (0 x 0802)
14:47:55.275 on 21 oct: ppp98 TPIF: State of the event [receive ConfReq +] [ACKrcvd to open]
14:47:55.295 on 21 oct: ppp98 PPP: Phase is AUTHENTICATING,
14:47:55.295 on 21 oct: ppp98 MS-CHAP-V2: O CHALLENGE id 1 len 28 of 'gw.izmv '.
14:47:55.295 on 21 oct: ppp98 TPIF: State is open
14:47:55.583 on 21 oct: ppp98 MS-CHAP-V2: I ANSWER id 1 len 71 of "domain\username".
14:47:55.583 on 21 oct: ppp98 PPP: Phase TRANSFER, tempting with impatience
14:47:55.583 on 21 oct: ppp98 PPP: Phase is AUTHENTICATING, unauthenticated user
14:47:55.587 on 21 oct: ppp98 PPP: request sent MSCHAP_V2 LOGIN
14:47:55.591 on 21 oct: ppp98 PPP: received LOGIN response PASS
14:47:55.591 on 21 oct: ppp98 PPP AUTHOR: author data NOT available
14:47:55.591 on 21 oct: ppp98 PPP: Phase TRANSFER, tempting with impatience
14:47:55.595 on 21 oct: Vi3 PPP: Phase is AUTHENTICATING, authenticated user
14:47:55.595 on 21 oct: Vi3: given msg No. MS_CHAP_V2
14:47:55.595 on 21 oct: Vi3 MS-CHAP-V2: SUCCESS O id 1 len 46 msg is "tG @ #QDD @(@B@ (@[email protected]/ ** / @I @:[email protected]/ ** / @@@ EJFDE)).
14:47:55.595 on 21 oct: Vi3 PPP: Phase is in PLACE
14:47:55.595 on 21 oct: Vi3 CPIW: protocol configured, start state cf. [original]
14:47:55.595 on 21 oct: Vi3 CPIW: State of the event [OPEN] [Initial report on startup]
14:47:55.595 on 21 oct: Vi3 CPIW: O CONFREQ [departure] id 1 len 10
14:47:55.595 on 21 oct: Vi3 CPIW: address of 192.168.207.1 (0x0306C0A8CF01)
14:47:55.595 on 21 oct: Vi3 CPIW: event [UP] State [begins to REQsent]
14:47:55.595 on 21 oct: Vi3 CCP: protocol configured, start state cf. [original]
14:47:55.595 on 21 oct: Vi3 CCP: State of the event [OPEN] [Initial report on startup]
14:47:55.595 on 21 oct: Vi3 CCP: O CONFREQ [departure] id 1 len 10
14:47:55.595 on 21 oct: Vi3 CCP: MS - PPC supported bits 0 x 01000060 (0 x 120601000060)
14:47:55.595 on 21 oct: Vi3 CCP: event [UP] State [begins to REQsent]
14:47:55.599 on 21 oct: % LINK-3-UPDOWN: Interface virtual-access.3, changed State to
14:47:55.603 on 21 oct: % LINEPROTO-5-UPDOWN: Line protocol on Interface virtual-access.3, changed State to
14:47:56.027 on 21 oct: Vi3 LCP: I have TERMREQ [open] id 3 len 16
14:47:56.027 on 21 oct: Vi3 LCP: (0x2F7C5F7E003CCD740000030A)
14:47:56.027 on 21 oct: Vi3 CPIW: event [BOTTOM] State [REQsent on startup]
14:47:56.027 on 21 oct: Vi3 CPIW: State of event [CLOSE] [begins with initial]
14:47:56.027 on 21 oct: Vi3 CCP: event [BOTTOM] State [REQsent on startup]
14:47:56.027 on 21 oct: Vi3 PPP DISC: MPPE required not negotiated
14:47:56.027 on 21 oct: Vi3 PPP: sending Acct event [low] id [8B]
14:47:56.027 on 21 oct: Vi3 CCP: State of event [CLOSE] [start with initial]
14:47:56.027 on 21 oct: Vi3 LCP: O TERMACK [open] id 3 len 4
14:47:56.027 on 21 oct: Vi3 LCP: event [receive TermReq] State [Open to stop]
14:47:56.027 on 21 oct: Vi3 PPP: Phase ENDS
14:47:56.027 on 21 oct: Vi3 LCP: event [CLOSE] [off status of closing]
14:47:56.675 on 21 oct: Vi3 PPP: block vaccess to be released [0x10]
14:47:56.675 on 21 oct: Vi3 LCP: event [CLOSE] State [closing closing]
14:47:56.679 on 21 oct: Vi3 LCP: event [BOTTOM] State [closing on Initial]
14:47:56.679 on 21 oct: Vi3 PPP: compensation AAA Id Unique = 8 b
14:47:56.679 on 21 oct: Vi3 PPP: unlocked by [0x10] always locked by 0 x [0]
14:47:56.679 on 21 oct: Vi3 PPP: free previously blocked vaccess
14:47:56.679 on 21 oct: Vi3 PPP: Phase is BROKEN
14:47:56.679 on 21 oct: % LINK-3-UPDOWN: Interface virtual-access.3, changed State to down
14:47:56.683 on 21 oct: % LINEPROTO-5-UPDOWN: Line protocol on Interface virtual-access.3, state change downstairs
I'll be very grateful for any useful suggestions
We had the same problem using MS-CHAP-V2 and 3945 router using IOS 15.2. When you add the same combination of username/password locally it worked fine but it wasn't no of course of the solution. We have solved this problem by adding the following line in the config file:
AAA authorization network default authenticated if
This is because Windows 2000 clients require the use of a statement of authorization aaa in the router config. Maybe it was default (and therefore not shown) previous iOS releases.
Success!
Wil Schenkeveld
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Hello
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However the L2L session does not appear on the hub when I check the active sessions.
The network diagram, as well as the PIX config and the screenshots of the VPN configuration for the IPSec-L2L tunnel is attached.
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I just noticed that the PIX firewall, the phase 1 paramateres are not configured. You must configure the same PASE 1 and phase 2 settings on both ends of the tunnel.
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We also use the ISE to authenticate administrators to connect to the firewall. Now what happens is, Cisco ASA valid also against policy, administrators and their default name Anyconnect.
Now the question is, how to set up different political requirement for access network admin and users the same Firewall VPN.
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See you soon,.
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You can get some ideas from this article of mine:
http://ltlnetworker.WordPress.com/2014/08/31/using-Cisco-ISE-as-a-generic-RADIUS-server/
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Hi guys,.
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Hi all
Please help to connect three sites with our Central site has all the resources for users, including internet access.
The three sites will be the ASA 5505 like their WAN device.
We need to know is - it possible, allowing to configure an IPsec Tunnel between the three ASA with duplicate LAN subnets.
Central site two networks 192.168.1.x 24, 192.168.100.x 24
Distance a 24 192.168.1.x subnet
Two remote a subnet 192.168.100.x 24
If it is possible we also do hair distance one ping, above two remote to the Central Site to access internet, what sites need are on the Central Site, including e-mail, network, other resource also records.
We have no other way to make this network, as all security is on our Central Site, website filtering, Application filtering, filtering of network traffic all.
We understand that we can change two remote sites to a different subnet from the Central Site, but we have so many host devices, it will take weeks or months, so to change the MS AD domain for all users, servers too.
We really need your expertise to do this in a laboratory and then in production.
Thank you
Hello Stephen,
You can check the following links for the subnets overlap talk to each other:-
1 LAN-to-LAN IPsec VPN with overlapping networks
http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a0080b37d0b.shtml
2 IPsec between two IOS routers with overlapping of private networks
http://www.Cisco.com/en/us/products/ps5855/products_configuration_example09186a0080a0ece4.shtml
Important point is local network must connect to the remote network via the translated addresses.
for example, you won't be ablt to use real IP of the communication.
For haripinning or turning U:
http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a00805734ae.shtml
Hope that helps.
Kind regards
Dinesh Moudgil
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VPN between a PIX and a VPN 3000
I'm trying to set up a VPN between PIX and a VPN 3000. All configurations are complete, but the tunnel has not been established. On the PIX, to 'see the crypto engine' and ' show isakmp his ' orders, I do not see the tunnel. Of "show ipsec his ' command, I can see the mistakes"#send"continues to increase when I try to connect to the remote network. Here is the copy - paste command:
Tag crypto map: myvpnmap, local addr. 10.70.24.2
local ident (addr, mask, prot, port): (10.70.24.128/255.255.255.128/0/0)
Remote ident (addr, mask, prot, port): (10.96.0.0/255.224.0.0/0/0)
current_peer: 10.70.16.5:0
LICENCE, flags is {origin_is_acl},
#pkts program: encrypt 0, #pkts: 0, #pkts 0 digest
#pkts decaps: 0, #pkts decrypt: 0, #pkts check 0
compressed #pkts: 0, unzipped #pkts: 0
#pkts uncompressed: 0, #pkts compr. has failed: 0, #pkts decompress failed:
#send 12, #recv errors 0
local crypto endpt. : 10.70.24.2, remote Start crypto. : 10.70.16.5
Path mtu 1500, fresh ipsec generals 0, media, mtu 1500
current outbound SPI: 0
SAS of the esp on arrival:
the arrival ah sas:
SAS of the CFP on arrival:
outgoing esp sas:
outgoing ah sas:
outgoing CFP sas:
Obviously, the PIX identifies protected traffic but failed to establish the tunnel. I was wondering what could be the reason for these kind of mistakes? That means them growing '#send errors?
Thank you very much!
Sending error mean simply the PIX is grateful to encrypt this traffic, but there is no built tunnel and so it must drop the package.
you will need to look at why the tunnel is not under construction however, "sending error" are just a byproduct of some other configuration issue. On the PIX, it looks like you would have something like:
Crypto ip 10.70.24.128 access list allow 255.255.255.128 10.96.0.0 255.224.0.0
On the 3000 under the L2L section and the Local and remote network, you need the exact opposite of the latter, then it would be:
/ Local network mask = 10.96.0.0/0.31.255.255
/ Remote network mask = 10.70.24.128/0.0.0.127
If you have something else the tunnel will fail to come. Otherwise, we see that the Cryptography debugs the PIX and the trunk of the 3000 when the tunnel is built.
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Use the client VPN tunnel to cross the LAN-to-LAN tunnel
I have been troubleshooting an issue and cannot cross an obstacle. The ASA is running ASA running 1,0000 code 24. I am using a client VPN tunnel to connect to the ASA. The ASA has already a LAN-to-LAN tunnel, set up and operating and I need the VPN client to access the remote site over the LAN-to-LAN tunnel.
The internal IP address of the local part is 192.168.0.0/24 and the IP address of the Remote LAN-to-LAN tunnel is 172.20.1.0/24. The clients are distributed 192.168.200.0/24 IPs. I have attached the relevant configuration for the SAA.
When the VPN client on the network, I can access resources on the ASA network internal. On the internal network of the SAA, users can access resources through the LAN-to-LAN tunnel. Client VPN cannot access resources on the LAN-to-LAN tunnel. For the latter, there are no hits on the C-TEST access list.
Thank you for your help.
try adding...
permit same-security-traffic intra-interface
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