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To: freebsd-ipfw@freebsd.org
From: Marcin Wisnicki <mwisnicki+freebsd@gmail.com>
Date: Mon, 21 Jun 2010 01:34:35 +0000 (UTC)
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Subject: Re: tcpdump on ipfw0 and ipv6
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On Sat, 19 Jun 2010 16:47:00 +0000, Marcin Wisnicki wrote:

> 
> however when I do `ipfw disable verbose` and `tpdump -ni ipfw0` all I
> can see is:
> 
> # tcpdump -ni ipfw0
> tcpdump: WARNING: ipfw0: no IPv4 address assigned tcpdump: verbose
> output suppressed, use -v or -vv for full protocol decode listening on
> ipfw0, link-type EN10MB (Ethernet), capture size 96 bytes
> 18:41:43.563579 IP6 , wrong link-layer encapsulationbad-hlen 0
> 18:41:43.563598 IP6 , wrong link-layer encapsulationbad-hlen 0
> 18:41:43.563747 IP6 , wrong link-layer encapsulationbad-hlen 0
> 

More verbose output:

# tcpdump -nei ipfw0 -s1600 -vvv
tcpdump: WARNING: ipfw0: no IPv4 address assigned
tcpdump: listening on ipfw0, link-type EN10MB (Ethernet), capture size 1600 bytes


03:33:17.205641 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 126: IP6 , wrong link-layer encapsulationbad-hlen 0
03:33:17.206322 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 190: IP6 , wrong link-layer encapsulationbad-hlen 0
03:33:17.206621 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 74: IP6 , wrong link-layer encapsulationbad-hlen 0
03:33:18.019095 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 126: IP6 , wrong link-layer encapsulationbad-hlen 0
03:33:18.020181 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 126: IP6 , wrong link-layer encapsulationbad-hlen 0
03:33:18.171231 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 126: IP6 , wrong link-layer encapsulationbad-hlen 0
03:33:18.172473 53:53:53:53:53:53 > 44:44:44:44:44:44, ethertype IPv4 (0x0800), length 126: IP6 , wrong link-layer encapsulationbad-hl