Network troubleshooting
Tools for debug a slow internet connection
TCP: out of memory
Journal entries like kernel: TCP: out of memory -- consider tuning tcp_mem
The sysctl fix mentioned in Medium article didn't solve the issue. It was finally solved by upgrading the kernel to v6.6 from Debian backports.
DOS / traffic analysis
- asncounter Count the number of hits (HTTP, packets, etc) per autonomous system number (ASN) and related network blocks.