I use Ubuntu server as part of my system and now I have seen something interesting. I have a router that sends me ethernet 802.11 packets.
I generate this packet in the router and then send it under UDP to my Ubuntu Server. This operation works fine on any other Ubuntu Desktop but not on my server.
The UFW is inactive and my iptable look like this:
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
And here is the UDP memory usage:
cat /proc/sys/net/ipv4/udp_mem
763227 1017637 1526454
In wireshark I don't see the packet and I really don't know what to do. Anyone have an idea?
cat /proc/sys/net/ipv4/udp_mem
with respect to your issue.