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Curious mostly about malformed updates coming from DOD ASN


From: Drew Weaver via NANOG <nanog () lists nanog org>
Date: Wed, 17 Jun 2026 12:17:36 +0000

Howdy,

I'm mostly just curious I've seen things like this before but more in the past 16 hours.

Are other folks seeing these?

Malformed UPDATE message received from neighbor (Lumen) (VRF: default) - message length 189 bytes, error flags 
0x00000080, action taken "TreatAsWdr". Error details: "Error 0x00000080, Field "Attr-length", Attribute 40 (Flags 0xc0, 
Length 37), Data [c0282500]". NLRIs: [IPv4 Unicast] 55.27.156.0/24<http://55.27.156.0/24> 
55.27.184.0/24<http://55.27.184.0/24> 55.74.158.0/24<http://55.74.158.0/24> 55.74.157.0/24<http://55.74.157.0/24> 
55.67.156.0/24<http://55.67.156.0/24> 55.74.156.0/24<http://55.74.156.0/24>

I'm wondering because it could be that the update itself is fine but my router cannot interpret it properly.

Thanks everyone, sorry for noise.

-Drew

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