Bridge not Forwarding ARP
lists.dan at gmail.com
Thu Apr 25 00:37:08 UTC 2019
I am trying to set up a bridged firewall in VMWare. I have a test setup
Internal --- vswitch --- (em2) Filter (em1) -- switch -- External
The Internal, Filter, and External servers are all running FreeBSD 11.2.
Filter has a bridge0 using members em1 (external side) and em2 (internal
If I ping from Internal to External I see ARP Requests on em2, bridge0, and
em1 of Filter. I see ARP Replies on em1 but they do not show up on
bridge0. This is the same with or without a firewall running on Filter.
If I ping from External to Internal then I see both ARP Requests and
Replies on all interfaces and the ping works.
I searched and read documentation and everything I can find says that ARP
packets should be forwarded over the bridge. Why are the ARP Replies only
being forwarded in one direction?
I was looking at sysctl output and I found kern.features.security_mac but
google search didn't turn up and documentation. I tried to change it
(sysctl and loader.conf) but it seems hard coded to 1.
I'm not really sure what to try. Any help would be appreciated.
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