TFTP over anycast

Fri Feb 23 15:57:19 UTC 2024

Others have addressed some of the issues, but one easy win for DHCP (which is otherwise a PITA to make redundany in *any* way) is to (a) not block ICMP anywhere, including on the client devices, and (b) have the DHCP ping before assignment.  That’s not always on by default, and it’ll eliminate ~90% of the conflicts you would otherwise encounter if the anycast node isn’t extremely stable.  If you become aware of a distributed DHCP server that actually works well in this environment, that’s worth a post to the list all by itself.
-Adam

Adam Thompson
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From: NANOG <nanog-bounces+athompson=merlin.mb.ca at nanog.org> On Behalf Of Javier Gutierrez
Sent: Thursday, February 22, 2024 12:47 PM
To: nanog at nanog.org
Subject: TFTP over anycast

Hi,
I'm working on some DR design and we want to not only have this site as a DR but also performing some active/active for some of the services we hosts and I was wondering if someone had some experience with using anycast for TFTP or DHCP services?
What are some of the pains/challenges you experienced and things we should lookout for?

Any input is greatly appreciated.

Kind regards,

Javier Gutierrez

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