May 2021 - Test - lists.nanog.org

IS-IS and IPv6 LLA next-hop - just Arista, or everyone?
by Adam Thompson 05 May '21

05 May '21

Hey, just checking as I don’t have any Cisco or Extreme or Juniper gear running IS-IS to verify myself… On current Arista (7280SR2K) and older Brocade (MLXe) routers, the IPv6 next-hop address in IS-IS seems to always be the link-local address of the neighbour, instead of any manually-assigned address on the interface. I believe this is *not* the case with Cisco, in particular. Not sure about other vendors, I don’t have any handy that can run IS-IS. I don’t appear to have any knobs to control this behaviour, and haven’t found anything related in the docs. Can anyone confirm that Cisco or other vendors does/do not do this (prefer LLA over GUA)? Thanks, -Adam Adam Thompson Consultant, Infrastructure Services [[MERLIN LOGO]]<https://www.merlin.mb.ca/> 100 - 135 Innovation Drive Winnipeg, MB, R3T 6A8 (204) 977-6824 or 1-800-430-6404 (MB only) athompson(a)merlin.mb.ca<mailto:athompson@merlin.mb.ca> www.merlin.mb.ca<http://www.merlin.mb.ca/>

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Comcast mail contact
by Nathanael Cariaga 05 May '21

05 May '21

Anyone from Comcast on this list? would appreciate if you can reach out off the list. Have a few concerns regarding Comcast servers intermittently throwing 550.5.1.0 -- invalid domain errors.

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Conagra Brands contact
by Andy Ringsmuth 03 May '21

03 May '21

Anyone on here from or associated with Conagra Brands, or know someone who is? We’re a Conagra contractor and running into an apparent e-mail black hole. Thanks, much appreciated. ---- Andy Ringsmuth 5609 Harding Drive Lincoln, NE 68521-5831 (402) 304-0083 andy(a)andyring.com “Better even die free, than to live slaves.” - Frederick Douglas, 1863

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Re: Google IP Geolocation
by Hank Nussbacher 03 May '21

03 May '21

The issues that others had earlier this month just hit us this morning. Users in Israel (132.74.0.0/15) trying to access Google.com or Youtube.com appear as coming from Iceland (see screenshot). Change happened overnight. Someone internally in Google's geo-location group typo'ed Israel as Iceland. We have GGC access and Google ISP Portal access but why should we have to change the geolocation which worked well since forever just because someone internally messed up? Regards, Hank

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link monitoring
by Baldur Norddahl 01 May '21

01 May '21

Hello We had a 100G link that started to misbehave and caused the customers to notice bad packet loss. The optical values are just fine but we had packet loss and latency. Interface shows FEC errors on one end and carrier transitions on the other end. But otherwise the link would stay up and our monitor system completely failed to warn about the failure. Had to find the bad link by traceroute (mtr) and observe where packet loss started. The link was between a Juniper MX204 and Juniper ACX5448. Link length 2 meters using 2 km single mode SFP modules. What is the best practice to monitor links to avoid this scenarium? What options do we have to do link monitoring? I am investigating BFD but I am unsure if that would have helped the situation. Thanks, Baldur

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