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08/02/2009 at 04:16AM PDT, ID: 24619697
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9.1

One way traffic only after IPSec tunnel established successfully

Asked by macassist in IPSec Security Protocol, Virtual Private Networking (VPN)

I'm trying to get some general idea about why traffic would only flow one way through an IPSec tunnel.

Both end devices (a Billion BiPAC 7402NX and a Cybertec 2000 series 3G modem/router) report a successfully established IPSec tunnel, but when I ping any device on the Cybertec end's subnet (or even the Cybertec's LAN address), I can see the traffic going out through the Billion, but no reply coming back.

I'm guessing there's some sort of routing problem at the Cybertec end and that it's sending traffic for the other end's LAN subnet over the WAN interface rather than through the tunnel (despite being told the tunnel is responsible for traffic to the the Billion's LAN subnet) - could there be any other causes?

I'll post config screens and tunnel establishment messages if necessary, but for the moment was trying to grasp generally what might be going wrong.

TIA

Sean
[+][-]08/02/09 05:18 AM, ID: 24998606

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[+][-]08/03/09 12:59 AM, ID: 25002481

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[+][-]08/03/09 03:30 AM, ID: 25003115

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About this solution

Zones: IPSec Security Protocol, Virtual Private Networking (VPN)
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Solution Provided By: Qlemo
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08/03/09 06:08 AM, ID: 25003955

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[+][-]08/03/09 06:44 AM, ID: 25004200

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[+][-]08/09/09 10:40 PM, ID: 25057373

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20091111-EE-VQP-91 - Hierarchy / EE_QW_3_20080625