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IX ARP Timeout
- Subject: IX ARP Timeout
- From: sthaug at nethelp.no (sthaug at nethelp.no)
- Date: Thu, 28 Jan 2016 08:06:12 +0100 (CET)
- In-reply-to: <662200281.11447.1453950132791.JavaMail.mhammett@ThunderFuck>
- References: <1241933342.11429.1453949242033.JavaMail.mhammett@ThunderFuck> <662200281.11447.1453950132791.JavaMail.mhammett@ThunderFuck>
> So I'm looking at the policies, recommended configurations, etc. of other IXes. We try to model a lot of ourselves on what the Europeans do (even if we come up short in some areas). I was reading through the AMS-IX guide.
>
> https://ams-ix.net/technical/specifications-descriptions/config-guide#3.1
>
> They recommend a four hour ARP timeout. Thoughts? Seems a bit excessive, but I don't have over 700 networks on my IX. That said, I don't have over 700 members on my IX generating a ton of ARP traffic, so I'm probably fine recommending a smaller value.
As far as I know 4 hours has been the Cisco IOS default for many years.
So you'll find millions of routers around the world with that value. I
agree that it may be excessive in some situations.
Steinar Haug, Nethelp consulting, sthaug at nethelp.no