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| author | Bob Gilligan <gilligan@vyatta.com> | 2009-05-08 13:36:18 -0700 |
|---|---|---|
| committer | Bob Gilligan <gilligan@vyatta.com> | 2009-05-08 13:36:18 -0700 |
| commit | 2cc639cacae969af4f36a7b587f86ac479ebe729 (patch) | |
| tree | 5ee944c355a9a8a3d849bd94f42dbd06478b0055 /scripts/firewall/firewall.init.in | |
| parent | e02bba9135b133ced2922258177e8f9cd0ae9f70 (diff) | |
| download | vyatta-cfg-firewall-2cc639cacae969af4f36a7b587f86ac479ebe729.tar.gz vyatta-cfg-firewall-2cc639cacae969af4f36a7b587f86ac479ebe729.zip | |
Bugfix 4340: Enable net.netfilter.nf_conntrack_tcp_be_liberal by default.
The parameter in question loosens the "acceptability" check on TCP
sequence and ACK numbers in the TCP conntrack module. This allows connection
tracking to survive certain cases where packet loss would cause it to
loose sync with the TCP endpoints.
Diffstat (limited to 'scripts/firewall/firewall.init.in')
| -rw-r--r-- | scripts/firewall/firewall.init.in | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/scripts/firewall/firewall.init.in b/scripts/firewall/firewall.init.in index f3b20b6..2c272d8 100644 --- a/scripts/firewall/firewall.init.in +++ b/scripts/firewall/firewall.init.in @@ -73,6 +73,12 @@ start () { iptables -t nat -N VYATTA_PRE_SNAT_HOOK iptables -t nat -A VYATTA_PRE_SNAT_HOOK -j RETURN iptables -t nat -A POSTROUTING -j VYATTA_PRE_SNAT_HOOK + + # Loosen the acceptability rules for TCP sequence and ACK numbers in + # conntrack. This allows TCP connections through NAT to survive certain + # cases of packet loss where conntrack can not accurately track the + # connection state + sysctl -q -w net.netfilter.nf_conntrack_tcp_be_liberal=1 } case "$ACTION" in |