Re: Compass udrc kernel panic

Basil Gunn

Curt, WE7U <> writes:

On Thu, 6 Dec 2018, Annaliese McDermond wrote:

If you?d like to know my offhand guess as to what?s happening, I?d
guess that Chromium is trying to do a broadcast to all interfaces for
some reason. Once you load the ax25 stack, the packet modem becomes
a network interface. This broadcast packet is probably triggering a
bug in the ax25 stack due to it having some sort of freaky address
(or more accurately no address) by the time it gets there. But this
is just a wild guess from hearing the symptoms.
Check Samba as well if it's loaded and running. It's a known
contributor to "talk to all interfaces" problems.
When I bring up an AX.25 machine I always install iptables & block the
following 3 addresses on both ax0 & ax1 interfaces. I noticed these
addresses being broadcast/multicast while looking at a traffic spy of my
RF interfaces.

iptables -A OUTPUT -o ax0 -d -p igmp -j DROP
iptables -A OUTPUT -o ax0 -d -p udp -m udp --dport 5353 -j DROP
iptables -A OUTPUT -o ax0 -d -p udp -m udp -j DROP

iptables -A OUTPUT -o ax1 -d -p igmp -j DROP
iptables -A OUTPUT -o ax1 -d -p udp -m udp --dport 5353 -j DROP
iptables -A OUTPUT -o ax1 -d -p udp -m udp -j DROP is used for IGMPv3 (multicast) protocol is Bonjour/mDNS request coming out of the Avahi daemon is Simple Service Discovery Protocol (SSDP) for uPNP

I agree with Curt that Samba & dropbox will broadcast on all
network addresses but you can fix both of these with proper
configuration of the app.


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