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jmc
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Joined: Fri Aug 07, 2020 6:25 pm

Slow DNS queries with brand new switch

Fri Aug 07, 2020 6:43 pm

Hi,
I just picked up a CSS326-24G-2S+RM running SwOS to replace a couple of little switches I had. I swapped the switch in for them, upgraded it to v2.12 and immediately started having very slow DNS lookups. Swapping back to one of the old switches resolved the issue.

By slow I mean going from single digit milliseconds to 1-2+ seconds per lookup.

I run a pihole which uses DoH out to Cloudflare for the DNS queries, but I get the same problem even if I set my machine to use 1.1.1.1 directly. In fact, if I plug the 326 into the old switch at all, I immediately get the problem, even when there is nothing else plugged into the 326!

Has anyone got any ideas/suggestions?

Many thanks,
James

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