Hi, I am attaching the patch for tc_class.c file in ./tc directory of iproute2 lastest version. This patch is to avoid segfault when listing classes. It happends only when using PRIO qdisc. I didn''t look why exactly it segfaults (guess becasue PRIO is classless), but this patch at least prevents it, so you can run the command and look what is happening to other classes. cd to iproute2 directory: # patch tc/tc_class.c antisegfault-patch-for-tc.diff # make # cp tc/tc /usr/bin tc -s class show dev eth0 now works Regards Nikolai