Hi, I've noticed that my network at home is rather struggling, and having done some investigation, I find that the router VM is dropping packets due to lots of: nf_conntrack: nf_conntrack: table full, dropping packet I find that there are about 2380 established and assured connections with a destination of my incoming mail server with destination port 25, and 2 packets. In the reverse direction, apparently only one packet was sent according to conntrack. E.g.: tcp 6 340593 ESTABLISHED src=180.173.2.183 dst=78.32.30.218 sport=49694 dport=25 packets=2 bytes=92 src=78.32.30.218 dst=180.173.2.183 sport=25 dport=49694 packets=1 bytes=44 [ASSURED] use=1 However, if I look at the incoming mail server, its kernel believes there are no incoming port 25 connetions, which matches exim. I hadn't noticed any issues prior to upgrading from 5.16 to 6.1 on the router VM, and the firewall rules have been the same for much of 2021/2022. Is this is known issue? Something changed between 5.16 and 6.1 in the way conntrack works? I'm going to be manually clearing the conntrack table so stuff works again without lots of packet loss on my home network... Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
