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strange issue with Site-to-Site VPN and VoIP

ToBu
Hi Community,

I have a strange issue with a Site-to-Site infrastructur consisting of a Astaro Security Gateway (version 8.305) and a Netgear FS-813 VPN-Router.
The VPN-connection between is these to devices is stabel until one tries to send a fax using our 3Com V3000 VoIP-system. Then the tunnel breaks down, meaning that to data of any kind may be transmitted between the two sites.
However - both the Astaro and the Netgear VPN-endpoint show the VPN-tunnel to be up and running. Only when tearing down and strarting the VPN-tunnel can the connection be established again.
I have not found any error messages in the logs of both VPN-endpoints.
Has anybody experienced a similar problem before ?

Thank you very much in advance.

Regards
Tobias


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  • 0
    Tobias,

    Have you resolved this?  You might try using QoS to guarantee bandwidth to IPsec traffic to the other site.  

    Cheers - Bob

    Sorry for any short responses!  Posted from my iPhone.
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • 0 in reply to BAlfson
    Hi,

    we now put our citrix branch repeaters into operation. Somwhow compressing everyhtring that flows over the vpn-tunnel seems to solve this issue, though I don't know how.

    Regards

    Tobias
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