GRE Tunnel Issues


#1

Dear All,

Today I do a small test to see what is GRE Feature on Peplink 380 (firmware 6.2.2). I got a strange issue so I need your kindly support.

Let’s see the network diagram first.


In the above topology, the Peplink will create a GRE Tunnel to Router A via the Local Link. Peplink Wan1 detail configuration is below:

  • Connection method: GRE.
  • Routing mode: NAT.
  • WAN: 172.16.1.1
  • WAN Subnet: /24.
  • WAN Default Gateway: 172.16.1.2
  • Remote GRE Host: 172.16.2.2
  • Tunnel Local IP Address: 192.168.1.2
  • Tunnel Remote IP Address: 192.168.1.1
  • Outgoing NAT IP Address: 192.168.1.2

I can see the GRE packet between Pelink and Router A but I cannot ping 192.168.1.1 on Peplink from Router A.
In addition, when I do a ping test from Peplink to 8.8.8.8, packet loss happen (image below).


Can anybody explain me how the GRE feature of Peplink work?

Thanks


#2

Hi,

GRE on WAN interface is used to connect to ISP. Please find here for more details based on your design.