The force is not strong with my networking skills so a quick question if I may?
When pinging across networks with multiple gateways, does an ICMP Ping need to follow the same route when returned to the source adapter, through the same gateway it entered??
I have just joined a 3rd subnet to our infrastructure and can ping from LAN1 and LAN2 to LAN3, but not from LAN3 back to LAN1 or LAN2 (on the same IP address range as the joining adapter).
Our main network is 10.10.10.x with 2 gateways joining the 2 companies Kerio router/firewalls.
Let me clarify:
LAN 1
10.10.9.0 (DMZ)
10.10.10.0/24 (LOCAL LAN)
10.10.9.1 (Default Gateway Adapter)
10.10.10.1 (Default Gateway Adapter)
Static routes:
10.10.11.0 use GW 10.10.10.200 Metric 1
10.10.12.0 use GW 10.10.10.200 Metric 1
10.10.20.0 use GW 10.10.10.5 Metric 1
LAN 2
10.10.10.0/24 (LOCAL LAN)
10.10.11.0/24 (LOCAL LAN)
10.10.12.0 (DMZ)
10.10.10.200 (Default Gateway Adapter)
10.10.11.200 (Default Gateway Adapter)
10.10.12.1 (Default Gateway Adapter)
Static routes:
10.10.9.0 use GW 10.10.10.1 Metric 1
10.10.20.0 use GW 10.10.10.5 Metric 1
LAN 3
10.10.10.5 (Default Gateway)
10.10.20.0/24 (LOCAL LAN)
10.10.20.1 (Default Gateway Adapter)
Static routes:
10.10.9.0 use GW 10.10.10.1 Metric 1
10.10.11.0 use GW 10.10.10.200 Metric 1
10.10.12.0 use GW 10.10.10.200 Metric 1
LAN 1 can ping devices and see shares in LAN 2 and LAN 3 (inc DMZ).
LAN 2 can ping devices and see shares in LAN 1 and LAN 3 (inc DMZ).
LAN 3 CAN NOT ping devices or see shares in LAN 1 or LAN 2 on the 10.10.10.x side (except for the gateway interfaces of 10.10.10.1 and 10.10.10.200, they respond)
LAN 3 CAN ping devices and see shares in LAN 2 on the 10.10.11.x side OK.
So, all traffic from LAN 3 is pinging from the 9,11,12,20 networks without error. It's only LAN 3 pinging to the 10 network that fails. (Apart from the gateway interfaces that respond).
I did manage to get a share to appear from LAN 3 using \\10.10.10.8\share but it took ages to connect and only worked from 1 PC from LAN 3.
I hope that makes sense?? It's been a long day tearing my hair out with this! Any help appreciated.