check this link for more info
http://lists.en.qi-hardware.com/pipermail/discussion/2011-January/006875.html
---
 target/linux/xburst/base-files/etc/sysctl.conf |   26 ++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)
 create mode 100644 target/linux/xburst/base-files/etc/sysctl.conf

diff --git a/target/linux/xburst/base-files/etc/sysctl.conf 
b/target/linux/xburst/base-files/etc/sysctl.conf
new file mode 100644
index 0000000..fb21a84
--- /dev/null
+++ b/target/linux/xburst/base-files/etc/sysctl.conf
@@ -0,0 +1,26 @@
+kernel.panic=3
+net.ipv4.conf.default.arp_ignore=1
+net.ipv4.conf.all.arp_ignore=1
+net.ipv4.ip_forward=1
+net.ipv4.icmp_echo_ignore_broadcasts=1
+net.ipv4.icmp_ignore_bogus_error_responses=1
+net.ipv4.tcp_ecn=0
+net.ipv4.tcp_fin_timeout=30
+net.ipv4.tcp_keepalive_time=120
+net.ipv4.tcp_syncookies=1
+net.ipv4.tcp_timestamps=0
+net.core.netdev_max_backlog=30
+net.netfilter.nf_conntrack_checksum=0
+net.ipv4.netfilter.ip_conntrack_checksum=0
+net.ipv4.netfilter.ip_conntrack_max=16384
+net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=3600
+net.ipv4.netfilter.ip_conntrack_udp_timeout=60
+net.ipv4.netfilter.ip_conntrack_udp_timeout_stream=180
+# net.ipv6.conf.all.forwarding=1
+
+# disable bridge firewalling by default
+net.bridge.bridge-nf-call-arptables=0
+net.bridge.bridge-nf-call-ip6tables=0
+net.bridge.bridge-nf-call-iptables=0
+
+vm.overcommit_memory=1
-- 
1.7.0.4

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