Network2/Experiments/OpenWRT

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Revision as of 18:33, 9 January 2010 by Mstone (talk | contribs)
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Installed OpenWRT.

Found that I could no longer ping my IP address from crank.

Examined firewall:

iptables -t mangle -L

Good, no mangling.

iptables -t nat -L

Some NAT, but just a couple of MASQUERADE rules.

iptables -t filter -L

Lots of filtering. In more detail:

iptables -t filter -L INPUT

Some complicated chains:

  • syn_flood rate-limits TCP connection control packets.
  • input_rule is empty
  • input has subchains for zone_wan and zone_lan.
  • zone_lan accepts everything.
  • zone_wan rejects everything not accepted by input_wan.

Okay, let's add an accept rule to input_wan:

iptables -t filter -A input_wan -p icmp -j ACCEPT


cat > /etc/config/radvd <<EOF
config interface
        option interface 'lan'
        option AdvSendAdvert 1
        option AdvManagedFlag 0
        option AdvOtherConfigFlag 0
        option AdvHomeAgentFlag 0
        option ignore 0

config prefix 
        option interface 'lan'
        option prefix '2001:470:1f07:6f7::/64'
        option AdvOnLink 1
        option AdvAutonomous 1
        option AdvRouterAddr 0
        option ignore 0
EOF
/etc/init.d/radvd start