some_negative_number, 20 Dec 2001
The kernel patch (not required since linux-2.4.7) adds statistics counters from route cache process into /proc/net/rt_cache_stat. A companion user mode program presents the statistics in a vmstat or iostat manner. The ratio between cache hits and misses gives the flow length.
Hopefully it can help understanding performance and DoS and other related issues.
An URL where newer versions of this utility can be (probably) found is ftp://robur.slu.se/pub/Linux/net-development/rt_cache_stat/
The format of the command is: