Помогите с iptables

Помогите с iptables, правила настроил, а при попытке iptables-save:

# Generated by iptables-save v1.2.3 on Sun Apr 14 19:20:39 2002
*nat
:PREROUTING ACCEPT [1639:179095]
:POSTROUTING ACCEPT [622:54428]
:OUTPUT ACCEPT [216:37817]
COMMIT
# Completed on Sun Apr 14 19:20:39 2002
iptables-save: libiptc/libip4tc.c:384: do_check: Assertion `h->info.valid_hooks
== (1 << 0 | 1 << 3)' failed.
Aborted                              

При добавлении правил проблем не было.
Че включить не знаю.