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I'm running two subnets internally. 10.1.10.0/24 and 10.20.0.0/20 for reasons too tedious to go into, I can't change this.
The router on the primary subnet is 10.1.10.254, my PN supplied TG582n.
I have a Windows RRAS server (VM) with two NICs, one on each network.
The 10.1.10.0/24 side of the RRAS server has its default gateway as the TH582n.
The TH582n has a route added to 10.20.0.0/24 via 10.1.10.15, the RRAS server.
I'm seeing lots of this error in the router's firewall logs:
FIREWALL icmp check (1 of 12): Protocol: ICMP Src ip: 10.1.10.15 Dst ip: 10.1.10.13 Type: Echo Reply Code: 0
It's not just the same destination address, but is always the same source.
If I tracert from the 10.20.0.0 subnet I get the following:
Tracing route to frinkhv03.frinkiac7.net [10.1.10.7]over a maximum of 30 hops: 1 <1 ms * 1 ms xxxxxxx07.frinkiac7.net [10.20.0.1] 2 * * * Request timed out. 3 1 ms 1 ms <1 ms xxxxxxx03.frinkiac7.net [10.1.10.7]
The request timed outs are the 10.1.10.254 router, if I tracert directly to it, I see this:
1 <1 ms * <1 ms xxxxxxx07.frinkiac7.net [10.20.0.1] 2 1 ms 1 ms <1 ms xxxxxxx01.frinkiac7.net [10.1.10.254]