[sudo-discuss] omni wifi going up and down constantly

[Jake]

thank you Yar, for fixing it and for communicating what happened.

Security is mostly a superstition. It does not exist in nature, nor do the
children of men as a whole experience it. Avoiding danger is no safer in the
long run than outright exposure. Life is either a daring adventure, or nothing.
Helen Keller

On Wed, 7 Feb 2018, Yardena Cohen wrote:

> I think I fixed this - can you try again?
>
> When we first set up the new router we had the same problem and solved
> it with an iptables rule to let DHCP traffic in & out which had been
> blocked before. The evidence is really obvious if you type journalctl
> on the router - you see a stream of error messages like:
>
> Feb 07 09:50:00 saros dhcpd[976]: send_packet: Operation not permitted
> Feb 07 09:50:00 saros dhcpd[976]: dhcp.c:3903: Failed to send 300 byte
> long packet over fallback interface.
>
> When writing the rules into a file to make it permanent, I tried to be
> too clever and added ' -o !enp3s0' to the rule because I thought, "who
> wants to send DHCP to the WAN anyway? What could possibly go wrong!"
>
> Then last week I rebooted the router, the new rules took effect, and
> the extra '-o !enp3s0' caused the rule to fail (still not sure why),
> thus blocking crucial DHCP traffic again. As soon as I replaced the
> rule just now with a simpler one, the error messages stopped.
>
> tl;dr my fault for being too secure sorry
>