Re: [LARTC] how to remove rules

[Roberto Nibali <ratz@drugphish.ch>]

Hi,

>  : I've had the same problem.  I sorta wish there was an "ip rule flush" 
>  : command that would leave only the default rules.

Would be nice.

> I have a function called "flush" which flushes all tables and all rules 
> other than the main routing table.  Here's the "rule" flush portion.  It 
> won't win any points for elegance, but it should get the job done:
> 
>     ip rule show | grep -Ev '^(0|32766|32767):' \
>       | while read PRIO RULE; do
>       ip rule del prio ${PRIO%%:*} $( echo $RULE | sed 's|all|0/0|' )
>     done

This is what I've used in my iproute2 shell library package, maybe it's 
a bit more elegant (only one fork involved). Since we change our local, 
main and default table in our distro to different values I've added a 
KEEP variable. Prepend it to adjust to your settings.

: ${KEEP:="local main default"}
while read prio rule; do
     continue=0
     for keep in ${KEEP}; do
         if [ "${rule//lookup ${keep}/}" != "${rule}" ]; then
             continue=1
         fi
     done
     if [ ${continue} -eq 0 ]; then
         ip rule del prio ${prio%%:*} ${rule//all/0/0}
     fi
done < <(ip rule show)

Best regards,
Roberto Nibali, ratz
-- 
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