GIF L2 Bridge and TCP not working
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Hi all,
I have two sites, flexo and clamps. My desired outcome is to have devices on VLAN 55 at clamps site to "be on" flexo's LAN. Currently bridging to VLAN 55 on flexo for testing, but will ultimately replace VLAN_TEST with LAN.
Diagram: https://i.imgur.com/DgVFkbs.png
I've added the GIF interface on each side to a bridge with the physical networks I want to join. I've got a VM client on the physical network on each side. Clients connected to VLAN_55 on clamps are getting their DHCP addresses, and can ping WAN addresses. These clients cannot complete a TCP session however
10.55.55.11 can do TCP just fine, but 10.55.55.10 and 10.55.55.12 can't. On BR_FLEXO on Flexo, I'm seeing a lot of blocked packets in TCP:SA state. Googling this leads to the Netgate documentation on Asymmetric Routing, but none of the advice seems to help.
Packet capture shows the same traffic on BR_FLEXO at each end, flexo and clamps.
How can I get TCP routing over my GIF properly?
Thanks!
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It's probably the same issue that effects GRE over IPSec: https://redmine.pfsense.org/issues/4479
The states are not created where they are expected meaning reply traffic is blocked as the firewall sees it as out of state.
The workaround for that is to use floating rules with sloppy states and 'any flags' set as shown in the asymmetric routing doc. It's not actually asymmetric but appears to be to the firewall.Steve
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Wow, thanks for the prompt response!
I missed the part about the floating rule in the documentation. Thanks! :)
