[OLSR-users] ICMP Redirects

[Holger Mauermann]

Hi,

I just noticed that my nodes still send out ICMP redirects, even if it
is disabled by olsrd on startup.

cat /proc/sys/net/ipv4/conf/eth1/send_redirects shows 0 on all nodes,
but tcpdump captures lots of redirects:

15:15:00.068250 IP ...6 > ...1: icmp 177: redirect ...4 to host ...4
15:15:00.107527 IP ...6 > ...4: icmp 129: redirect ...1 to host ...1
15:15:00.934280 IP ...2 > ...7: icmp 89: redirect ...1 to host ...1
15:15:04.742682 IP ...2 > ...4: icmp 113: redirect ...1 to host ...1

4 can't see 1, so 4 has a route to 1 via 6 and 1 has a route to 4 via 6.
However, 6 sends back to 1 that it should try 4 directly and to 4 that
it should try 1 directly... Can this lead to problems? Should I ignore
this or is it better to block this ICMP type with the firewall?


-- 
\-- Holger Mauermann
 \-- (spam-protected)
  \-- PGP Key Id: 0x8EA8C301