[strongSwan] Help: Issue with routing internet traffic through tunnel

Harikrishna Patnala harikrishna.patnala at accelerite.com
Tue May 7 10:22:25 CEST 2019

Hi all,

We want to send all the traffic (including internet traffic) from Site A clients through the tunnel to Site B. Now Site B should forward to internet and send the response back to Site A.

Site A subnet :
Site B subnet :

[Site A client]  ===internet_traffic===>  [Site A router]  ===internet_traffic===>  ||   TUNNEL   ||  ===internet_traffic===> [Site B router]  ===internet_traffic===> [WEBSITES]

I have configured Site A’s right subnet with subnet and the internet traffic is sent to Site B through tunnel.

I can see packets (ICMP echo request in the below log) coming to Site B's router but there is no reply packet.

06:46:17.970356 IP > ESP(spi=0xce80ace9,seq=0x3a), length 132
06:46:17.970356 IP > ICMP echo request, id 30485, seq 9, length 64

I suspect that IPSec is not forwarding the packets from Site B, Can you please suggest a way to forward traffic to internet using IPsec.

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