ASA: S2S Tunnel stops with higher traffic

Hello

I have no idea where I have to start solving our problem:

Site A: ASA 5520/9.2 (4) 5 ~ 20 IPsec tunnels

Site b: ASA 5505/9.2 (4) 5

When I do a SSH (or HTTP or any other TCP) session from Site A to any Linux on Site B server, I can connect, but when I do something as a "dmesg" or long "ls - al", the session hooked after 10 to 20 lines. Also HTTP sessions (as a site to set up a printer), smaller Web sites are okay (but slow), more big sites stops with a browser timeout.

This only happens on one site, all other sites work very well (which have the same config, same OS ASA).

Just to test, I opened the ssh port to the external IP address on the external interface and it works very well, as well as with the traffic through the tunnel going something wrong.

Any idea, where do I start debugging?

Gruss ivo

PS: How is stupid cloudflare, they check this text and do not allow to write the ls command linux less al, but ls space space space less al works!

You can twist on the SAA mss using this doc and empty the outside df bit as well. Follow the steps described in the section "VPN encryption error."

Crypto ipsec df - bit clear-df outdoors

Let us know how it rates.

Kind regards
Dinesh Moudgil

PS Please rate helpful messages.

Tags: Cisco Security

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    ------------------

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    A.

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    I want to monitor a remote host on the other side a VPN. The local endpoint is my ASA.

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    However, I like to use "ip sla" on the SAA itself to monitor a remote host with icmp ping 192.168.1.0. This would imply NATting one IP on the ASA to 10.19.124.1, but I do not see how to do this. None of the interfaces on the SAA are logical, to use as a source for this interface.

    Thanks for ideas and comments.

    Concerning

    You are absolutely right, that unfortunately you won't able to NAT interface ASA IP address. NAT works for traffic passing by the ASA, don't not came from the SAA itself.

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    access-list extended 110 permit ip 192.168.191.0 255.255.255.0 66.18.106.160 255.255.255.224
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    access-list extended 100 permit tcp any host 207.98.218.27 eq 9001
    access-list extended 100 permit tcp any host 207.98.218.28 eq 9000
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    Global interface (CharterBackup) 1
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    NAT (DMZ) 1 0.0.0.0 0.0.0.0
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    Route 0.0.0.0 CharterBackup 0.0.0.0 71.14.9.49 254
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    No snmp Server contact
    Server enable SNMP traps snmp authentication linkup, linkdown cold start
    monitor SLA 123
    type echo protocol ipIcmpEcho 4.2.2.2 outside interface
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    Annex ALS life monitor 123 to always start-time now
    Crypto ipsec transform-set esp - esp-md5-hmac romanset
    Crypto ipsec transform-set esp-aes - AES-128-SHA esp-sha-hmac
    Crypto-map dynamic dynmap 10 transform-set romanset
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    card crypto romanmap 10 game of transformation-AES-128-SHA
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    romanmap interface card crypto outside
    crypto isakmp identity address
    crypto ISAKMP allow outside
    crypto ISAKMP policy 10
    preshared authentication
    the Encryption
    md5 hash
    Group 2
    life 86400
    crypto ISAKMP policy 20
    preshared authentication
    aes encryption
    sha hash
    Group 2
    life 86400
    !
    track 1 rtr 123 accessibility
    Telnet 0.0.0.0 0.0.0.0 inside
    Telnet timeout 5
    SSH 0.0.0.0 0.0.0.0 outdoors
    SSH 0.0.0.0 0.0.0.0 CharterBackup
    SSH timeout 5
    Console timeout 0
    management-access inside
    dhcpd dns 8.8.8.8
    dhcpd outside auto_config
    !
    dhcpd address 192.168.100.100 - DMZ 192.168.100.130
    dhcpd enable DMZ
    !

    internal group xxxxx policy
    attributes of the strategy group xxxxx
    value of server WINS 192.168.190.3
    value of server DNS 192.168.190.3
    Split-tunnel-policy tunnelspecified
    Split-tunnel-network-list value split
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    tunnel-group xxxxx General attributes
    address vpnpool pool
    Group Policy - by default-romangroup
    tunnel-group ipsec-attributes xxxxx
    pre-shared-key *.
    ISAKMP ikev1-user authentication no
    tunnel-group 66.18.99.68 type ipsec-l2l
    IPSec-attributes tunnel-group 66.18.99.68
    pre-shared-key *.
    !
    class-map inspection_default
    match default-inspection-traffic
    !
    !
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    parameters
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    Policy-map global_policy
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    inspect the preset_dns_map dns
    inspect the ftp
    inspect h323 h225
    inspect the h323 ras
    inspect the rsh
    inspect the rtsp
    inspect esmtp
    inspect sqlnet
    inspect the skinny
    inspect sunrpc
    inspect xdmcp
    inspect the sip
    inspect the netbios
    inspect the tftp
    !
    global service-policy global_policy
    context of prompt hostname

    Currently, traffic that originates on 192.168.190.0/24 generates no traffic phase 1.  However, if the traffic is coming in FRO the side remote (66.18.106.160/27) the tunnel arrives, but no traffic passes.

    Although this isn't my area of expertise, it seems to me that my ASA is not 'see' interesting traffic from 192.168.190.0/24 will 66.18.106.160/27.

    Any help you could provide would be GREATLY appreciated.

    Just remove the 2 following lines:

    access-list extended 110 permit ip 192.168.190.0 255.255.255.0 66.18.106.160 255.255.255.224

    access-list extended 110 permit ip 192.168.191.0 255.255.255.0 66.18.106.160 255.255.255.224

    Then 'clear xlate '.

    That should solve your problem.

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