AR1200 SIP trunk cannot change back after GRE tunnel switcover

Created May 11, 2018 14:39:44Latest reply May 19, 2018 09:25:14 720 4 0 0
Issue Description

Between AR1220C and AR1220E, connect to ISP and reach each other. GRE over IPSec also be set up between the two device. when the GRE tunnel is ok, the SIP voice traffic will go through the GRE tunnel. If the GRE tunnel down, the SIP voice traffic will go out with NAT and reach to each other. The issue is that, when GRE tunnel down, the SIP voice switch to NAT. But when the GRE tunnel recover, the SIP vioce traffic cannot switch back to GRE tunnel.

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Configure on AR1220C:

#


interface Dialer1


 link-protocol ppp


 ppp chap user xxx


 ppp chap password xxx


 mtu 1492


 ip address ppp-negotiate


 dialer user gardppp


 dialer bundle 1


 nat outbound 2999 


 zone WAN


 ntp-service in-interface disable


#

#

interface Tunnel0/0/3

 ip address 10.255.0.25 255.255.255.252

 tunnel-protocol gre

 keepalive

 source x.x.x.x

 destination x.x.x.x

 tunnel route-via Dialer1 mandatory

 zone LAN

#


transparent.gif Handling Process

1.When the GRE tunnel is up, the VOIP traffic go through GRE tunnel. It means that the routing to each other is right.

2. When the GRE tunnel is down, the VOIP traffic go out with NAT, and reach each other. It means that the path switchover is ok.

3. When the GRE tunnel up again, the routing to the peer site can learn through the GRE tunnel. At that time, the nat session table still active. As the nat session table has higher priority than the routing table, so the voice traffic still go through NAT.

4. When customer reset the NAT session, the current session will be reseted. There is no nat session table, the traffic will check the routing table again, the traffic will go through GRE tunnel again.

transparent.gif Root Cause

The nat session table has higher priority than the routing table, so the voice traffic still go through NAT. When customer reset the NAT session, the current session will be reseted. There is no nat session table, the traffic will check the routing table again, the traffic will go through GRE tunnel again.

transparent.gif Solution
According to customer's network topology and solution, the issue is normal and cannot be resolved. It is not software bug. 
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Busy_with_lazy_mind  Moderator   Created May 14, 2018 08:43:01 Helpful(0) Helpful(0)

Good sharing.
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No.9527  Mentor   Created May 18, 2018 16:39:30 Helpful(0) Helpful(0)

Amazing.. This worked perfectly for me..
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Finn92  Novice   Created May 18, 2018 19:00:01 Helpful(0) Helpful(0)

Amazing~~~
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w1  Moderator   Created May 19, 2018 09:25:14 Helpful(0) Helpful(0)

:)
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