I ought to know this, or be able to figure it out, but I'm getting stupid in my old age...
I have two networks at home: 172.16.2.x/24 (ethernet) and 172.17.2.x/24 (WiFi). There's an OpenWRT router between them, and also a couple of Linux boxes with interfaces on both networks. My WiFi-only machines can ping any other WiFi interface, either interface on the router, and machines with only an ethernet interface. However, they can't ping the ethernet address of the dual-homed machines (except for the OpenWRT router's ethernet interface). All the dual-homed machines are set up to forward IP, although they're not set as anybody's default route. The dual-homed machines can ping anybody, although of course they use the interface on the appropriate network to do it. When I tcpdump on a dual-homed machine and ping from a WiFi machine to the ethernet address of the dual-homed box, I see the ping packets arriving, but no pong packets going back. I thought maybe the dual-homed machine was replying from the WiFi interface (causing ARP problems, maybe?) or sending to their default router, but I don't see anything like that happening. Any other ideas for what to look for? Thanks, -- Mersenne Law LLP · www.mersenne.com · +1-503-679-1671 - Small Business, Startup and Intellectual Property Law - 9600 S.W. Oak Street · Suite 500 · Tigard, Oregon 97223
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