>Number:         34172
>Category:       bin
>Synopsis:       tcpdump doesn't catch any non-IP packet on gre(4) interface
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 09 09:10:00 +0000 2006
>Originator:     Mihai Chelaru
>Release:        NetBSD 3.99.20
>Organization:
	
>Environment:
	
	
System: NetBSD mpls.girsa.ro 3.99.20 NetBSD 3.99.20 (ayame-mpls) #0: Tue Aug 8 12:22:30 EEST 2006 root@mpls.girsa.ro:/usr/src/sys/arch/i386/compile/ayame-mpls i386
Architecture: i386
Machine: i386
>Description:
	
	I created a gre tunnel in order to send some MPLS unicast frames over it. They are passing fine but
	tcpdump can't catch any of it.

mpls# tcpdump -l -n -vvv -i gre0 ether proto 0x8847
tcpdump: expression rejects all packets
mpls# tcpdump -l -n -vvv -O -i gre0 ether proto 0x8847
tcpdump: listening on gre0, link-type NULL (BSD loopback), capture size 96 bytes
^C
0 packets captured
14 packets received by filter
0 packets dropped by kernel

	During this I left an icmp ping that is encapsulated into MPLS on a router connected via tunnel gre0.
	The only ether proto I saw working was 0x0800 (IP).
	
>How-To-Repeat:
	
>Fix:
	

>Unformatted: