root@OpenWrt:~# iptables -A forwarding_rule -j LOG
iptables: No chain/target/match by that name

root@OpenWrt:~# ipkg list_installed |grep iptables
iptables - 1.3.3-1 - The netfilter firewalling software for IPv4
iptables-mod-conntrack - 1.3.3-1 - Iptables (IPv4) extensions for connection tracking
iptables-mod-extra - 1.3.3-1 - Other extra Iptables (IPv4) extensions
iptables-mod-filter - 1.3.3-1 - Iptables (IPv4) extension for packet content inspection
iptables-mod-ulog - 1.3.3-1 - Iptables (IPv4) extension for user-space packet logging

root@OpenWrt:~# lsmod
Module                  Size  Used by    Tainted: P
pppoe                   9384   1
pppox                   1372   1 [pppoe]
ppp_generic            21892   3 [pppoe pppox]
slhc                    6352   0 [ppp_generic]
wlcompat               14896   0 (unused)
wl                    423640   0 (unused)
et                     32064   0 (unused)
diag                    2560   0 (unused)