solarbird: (molly-thats-not-good-green)
[personal profile] solarbird

I’m finally getting back to working on a new gateway/router server and I’m basically setting up this old-school sort of DMZ, with the rest of our servers hanging off one card, and our internal LAN/DHCP/NAT side hanging off the other. (Using ISC, which Debian seems to like.) And all of that seems to be right from the new server’s perspective, which is yay!

Except there’s no packet forwarding from the DHCP side even though it’s enabled and I’m sure I enabled it and yes the kernel thinks its enabled but it isn’t happening.

Any ideas where to start?

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HALLO IS IT PLUGGED IN

Date: 2017-06-24 01:05 pm (UTC)
rmd: (Default)
From: [personal profile] rmd
speaking from near ignorance about that particular debian setup, but with some clue about larger scale networks, is debian configured to act as a dhcp relay, here? I think dhcp-relay is a separate package, so I figured I'd ask the stupid question.

Re: HALLO IS IT PLUGGED IN

Date: 2017-06-25 09:39 am (UTC)
vatine: Generated with some CL code and a hand-designed blackletter font (Default)
From: [personal profile] vatine
If the problem is "thing tries to get DHCP from the other side of a router, but it fails", then, you would need something to relay the DHCP request, since it's sent to the ethernet broadcast MAC (and probably 255.255.255.255 as the IP destination) and isn't supposed to transit through routers.

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