Public bug reported:
Binary package hint: quagga
In Ubuntu Server Ubuntu 10.04.1 LTS reverse path filtering is enabled
(1) by default which causes havoc with BGP and potentially and other
routing protocol in which a packet may go out one (1) interface but
return in another interface. The installation package needs to turn off
reverse path filtering so that routing works correctly.
Editing /etc/sysctl.conf to have the following entries resolves this
problem:
net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.all.rp_filter=0
Also from a shell prompt running the following will resolved the issue:
sysctl -w net.ipv4.conf.eth0.rp_filter=0
sysctl -w net.ipv4.conf.eth1.rp_filter=0
sysctl -w net.ipv4.conf.eth2.rp_filter=0
sysctl -w net.ipv4.conf.eth3.rp_filter=0
sysctl -w net.ipv4.conf.all.rp_filter=0
sysctl -w net.ipv4.conf.default.rp_filter=0
To confirm if Reverse Path Filter is on (1) or off (0) the following command
will show that:
sysctl -a | grep \\.rp_filter
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.lo.rp_filter = 0
net.ipv4.conf.eth0.rp_filter = 0
net.ipv4.conf.eth1.rp_filter = 0
net.ipv4.conf.eth2.rp_filter = 0
net.ipv4.conf.eth3.rp_filter = 0
** Affects: quagga (Ubuntu)
Importance: Undecided
Status: New
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Install needs to turn off Reverse Path Filtering
https://bugs.launchpad.net/bugs/625812
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