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When trying to create certain rules, an invalid error is returned:

~ # ip6tables -A INPUT -p icmpv6 --icmpv6-type redirect -m hl ! --hl-eq 255 -j
DROP -m comment --comment "this is a comment"
ip6tables v1.4.7: Can't specify HL option twice
Try `ip6tables -h' or 'ip6tables --help' for more information.

The error is invalid because the HL option is not specified twice. Removing the
comment from the rule works as expected.


Version-Release number of selected component (if applicable):
ip6tables v1.4.7


How reproducible:
Always.


Steps to Reproduce:
Execute the following command as root:
ip6tables -A INPUT -p icmpv6 --icmpv6-type redirect -m hl ! --hl-eq 255 -j
DROP -m comment --comment "husk line 13"

  
Actual results:
ip6tables v1.4.7: Can't specify HL option twice
Try `ip6tables -h' or 'ip6tables --help' for more information.


Expected results:
No error; corresponding rule is entered into the appropriate kernel netfilter table/chain.

Additional info:
The issue has been reported and appears to have been resolved upstream:
http://bugzilla.netfilter.org/show_bug.cgi?id=766

Original bug report when I discovered the problem:
https://github.com/fukawi2/husk/issues/8

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.

I am sorry, but this can not be easily fixed without breaking other parts of iptables. iptables upstream created a completely new parser because of similar problems and this is too invasive for version 1.4.7.

Closing as CANTFIX.