[root@localhost root]# ls /lib/modules/`uname -r`/kernel/net/ipv4/netfilter|grep masq
ip_fw_compat_masq.o
[root@localhost root]# cat /lib/modules/`uname -r`/modules.dep|grep -i masq
/lib/modules/2.4.20-8/kernel/net/ipv4/netfilter/ip_fw_compat_masq.o: /lib/modules/2.4.20-8/kernel/net/ipv4/netfilter/ip_nat_core.o \
/lib/modules/2.4.20-8/kernel/net/ipv4/netfilter/ipt_MASQUERADE.o: /lib/modules/2.4.20-8/kernel/net/ipv4/netfiltr/ip_conntrack.o \[root@localhost root]# lsmod |grep ip
ipt_mac 1208 1 (autoclean)
ip_conntrack_ftp 5296 0 (unused)
iptable_mangle 2776 0 (autoclean) (unused)
iptable_nat 21176 0 (autoclean)
ipt_state 1048 2 (autoclean)
ip_conntrack 26976 3 (autoclean) [ip_conntrack_ftp iptable_nat ipt_state]
ipt_limit 1560 0 (autoclean)
ipt_string 2680 2 (autoclean)
iptable_filter 2412 1 (autoclean)
ip_tables 15096 9 [ipt_mac iptable_mangle iptable_nat ipt_state ipt_limit ipt_string iptable_filter]