Problems with Multiple VPN Passthrough

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by cyril_cbo, Sep 27, 2005.

  1. cyril_cbo

    cyril_cbo Guest


    we are 4 people in the office simultaneously using the XP (SP2) VPN clients to connect a remote VPN server (4 VPN pass through at the same time). The local router is a WRV54G with latest firmware (2.37). some stations are wired some are wireless.

    After a while (minustes or hours) the VPN remote gateway doesn't repond to ping command (ping timeout) and it becomes really difficult to restart/reconnect the VPN client (error 800). If i restart the local router it solves the issue for the next couple of hours. The internet connection always works.

    Here is the config
    - router has static IP with direct internet connection (no other modem or equipement)
    - IPSec, L2TP and PPTP Passthrough are all enabled.
    - the router MTU is set to 1398 so that packet are not fragmented when accessing the remote VPN gateway.
    - Port trigerring is enabled for port 500 and 1723.
    - XP registries are modified according to microsoft KB885407 article: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec

    I had a look at the router logs and found several warning/errors:
    alg_nat_states_add: Failed to add NAT state
    alg_nat_states_add: Failed to add NAT state
    pptp_gre_connect() Couldn't add GRE nat
    alg_nat_states_add: Failed to add NAT state
    alg_nat_states_add: Failed to add NAT state

    as well as :

    DNS: trying forwarder
    DNS: trying forwarder
    DNS: too many forwarded messages
    DNS: trying forwarder
    DNS: trying forwarder

    Anybody has the same configuration or problems? Where can i find more about these error messages?

  2. TazUk

    TazUk Network Guru Member

    As you have a VPN router why are you not using that to make the VPN connection to the remote end rather than each client individualy?
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