GRE tunnel issue

[bensonlei]

Hi, Guy,

Two ISP links are using 20M bandwidth: no packet loss tested in these ISP links.

Two GRE tunnels are built in two separated Layer 3 devices/Firewalls, it is weird that when traffic is switched over from one tunnel to another tunnel; bandwidth utilization is quite different. The first tunnel was using 20M bandwidth, but now traffic is using only 10M bandwidth; any hint to troubleshoot the tunnel issue ?

[Giuseppe Larosa]

Hello Bensonlei,

you should provide additional info in order to get better help:

what are the devices involved ?  Model and SW version

You speak of GRE tunnels, however are those GRE Tunnels protected by IPSec?

Are the GRE endpoints the same as IPSec endpoints or different ?

What kind of traffic is carried over GRE (eventually also over IPSec) is TCP based?

In this case the end to end delay on the two ISPs play a key role.

Hope to help

Giuseppe

[bensonlei]

Hi Giuseppe,

Thx so much for your reply,

They are simple GRE tunnel, no IPsec...

We shall test the results again, for the verification of GRE configurations