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MPLS over 802.1Q Ethernet parsing #115

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guyharris opened this issue Apr 16, 2013 · 2 comments
Closed

MPLS over 802.1Q Ethernet parsing #115

guyharris opened this issue Apr 16, 2013 · 2 comments

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@guyharris
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Converted from SourceForge issue 2796822, submitted by ericaustin

We run MPLS over an 802.1q tagged Ethernet link (2 labels deep on the MPLS). It looks like tcpdump fails to parse the packets properly in this scenario. Just MPLS seems to work and just 802.1q tagged seems to work but the combination of the two kills it. Coincidentally, Snort seems to have the same issue but Wireshark parses it fine.
@guyharris
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Submitted by ericaustin

Nevermind; user error. I did not realize I had to do mpls popping twice since there are two labels. 'vlan and mpls and mpls and ip' works. I thought 'vlan and mpls and ip' would work.

@infrastation
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For posterity, there is now a FAQ entry about this.

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@infrastation @guyharris