I'm trying to change the value of the TTL field with this line: $IPTABLES -t mangle -A PREROUTING -i $INET_IFACE -p igmp -j TTL --ttl-inc 1 But when I try to execute this I have this error: iptables: No chain/target/match by that name This seems to be the problem: -j TTL --ttl-inc 1 But I found it in the manpage: iptables -j TTL --help: ... --ttl-inc value Increment TTL by <value> ... What am I doing wrong? uname -a: Linux server 2.6.2 #1 Thu Apr 8 12:02:31 CEST 2004 i686 GNU/Linux modprobe -l: /lib/modules/2.6.2/kernel/net/ipv4/ipip.ko /lib/modules/2.6.2/kernel/net/ipv4/ip_gre.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/iptable_nat.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/iptable_mangle.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/iptable_filter.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_ttl.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_tos.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_tcpmss.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_state.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_recent.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_pkttype.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_owner.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_multiport.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_mark.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_mac.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_limit.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_length.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_iprange.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_helper.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_esp.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_ecn.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_dscp.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_conntrack.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_ah.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_ULOG.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_TOS.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_TCPMSS.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_SAME.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_REJECT.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_REDIRECT.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_NETMAP.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_MASQUERADE.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_MARK.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_LOG.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_ECN.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_DSCP.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ipt_CLASSIFY.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ip_tables.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ip_nat_irc.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ip_nat_ftp.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ip_conntrack_irc.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ip_conntrack.ko /lib/modules/2.6.2/kernel/net/ipv4/netfilter/ip_conntrack_ftp.ko
