% /sbin/ip route flush cache Cannot open "/proc/sys/net/ipv4/route/flush" The above pretty much says it all. FWIW /pro/sys/net/ipv4/route looks fully populated, all the files are "644 root root". I filed the bug against FC4t1, but in truth this is a rawhide machine, so its a week or two more current than FC4t1.
Ehm, I've never used this before so here're my observations # ip route show cache - shows a big mess of different routes # ip --statistics route flush cache *** IPv4 routing cache is flushed. (according to a man page, it should show no. of flushed routes, I'll check this) # ip route show cache broadcast 192.168.1.255 from 192.168.1.21 dev lo src 192.168.1.13 cache <local,brd,src-direct> iif eth0 eg. it shows only one route, a broadcast message, so it might have appeard right after the flush command. The problem of flush command is that it doesn't flush all routes immediatelly but there's a delay which may cause dealy. If you call `show cachce` right after flushing it there still might be old data. This comes from my tests on FC4t1 (installed 5mins ago :)