Good afternoon,
I’m trying to establish Zscaler GRE tunnel from a VeloCloud SDWAN Edge that is connected behind a RUTX50. The RUTX50 is connected via SIM 1 to WAN.
I did tcpdump -i br-lan proto gre and see that GRE traffic is sent out but there’s no return traffic.
I tried
iptables -I INPUT -j ACCEPT
iptables -I FORWARD -j ACCEPT
as well, but still with the same result. GRE tunnel from VeloCloud is not established.
I reduced the MTU for mob1s1a1 to 1300 with the same result.
Zscaler GRE is working fine from the same VeloCloud Edge via different DSL circuit.
What is there that I haven’t looked at?