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#!/bin/sh
gen_filter()
{
IFS=. read a b c d
[ "$a" -a "$b" -a "$c" -a "$d" ] || return
cprime=$((c+1))
echo s/$a\\.$b\\.$c\\.\\\([0-9]*\\\)/$a.$b.$cprime.\\\\1/g
}
get_default()
{
ip route | grep '^default via 192\.168\.[^.]*\.1' |
(read default via what ip; [ "$what" ] && echo $what)
}
get_default | gen_filter
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