1 files changed, 18 insertions, 0 deletions

diff --git a/src/generate-network-filter.sh b/src/generate-network-filter.sh
new file mode 100755
index 0000000..a2e49d0
--- /dev/null
+++ b/src/generate-network-filter.sh
@@ -0,0 +1,18 @@
+#!/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
+