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 Consultant, Infrastructure Services [cid:image001.png@01DA663E.AD5957D0] 100 - 135 Innovation Drive Winnipeg, MB R3T 6A8 (204) 977-6824 or 1-800-430-6404 (MB only) https://www.merlin.mb.ca<https://www.merlin.mb.ca/> [cid:image002.png@01DA663E.AD5957D0]Chat with me on Teams<https://teams.microsoft.com/l/chat/0/0?users=athomp...@merlin.mb.ca> [https://res-h3.public.cdn.office.net/assets/bookwithme/misc/CalendarPerson20px.png]<https://outlook.office.com/bookwithme/user/a3e87142ccc14503bf5ec7ea59afd...@merlin.mb.ca?anonymous&ep=bwmEmailSignature> Book time to meet with me<https://outlook.office.com/bookwithme/user/a3e87142ccc14503bf5ec7ea59afd...@merlin.mb.ca?anonymous&ep=bwmEmailSignature> From: NANOG <nanog-bounces+athompson=merlin.mb...@nanog.org> On Behalf Of Javier Gutierrez Sent: Thursday, February 22, 2024 12:47 PM To: nanog@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
