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Author Topic: RFS7000 - AP652x MTU?  (Read 3133 times)

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Offline ajohnson

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RFS7000 - AP652x MTU?
« on: January 15, 2014, 02:24:04 PM »
Recently we've been trying to diagnose the source of some network issues at one of our sites, and a port-mirrored packet capture of the router servicing the site shows a large amount of UDP traffic between the RFS7000 here at the datacenter and the 32 AP6521 units at the site.  This is more or less expected since they're running a guest wireless network tunneled back to the RFS. 

The DS3 servicing the site will fragment any packets larger than 1472.  Is there a way I can change the MTU on the access point in the profile or something?  I've looked all over the place and I can't find anything other then stuff about L2TPv3 and PPP tunnels, and MiNT, but I don't believe we're using any of those.

Thanks in advance,
Aaron


Offline noobie

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Re: RFS7000 - AP652x MTU?
« Reply #1 on: January 15, 2014, 03:12:39 PM »
Hi,

You are using MiNT, and that is where you need to change MTU size.
All APs and controllers on W5 are using MiNT, so go to:
>en
#conf t
#mint-policy global-default
#mtu 1472 (in your case)
#com wr

This is global policy and this is the only place where you can change it.

You can find more info here, chapter 10, MiNT MTU:
https://portal.motorolasolutions.com/Support/XU-EN/Resolution?solutionId=91999&productDetailGUID=eb5541deda4cf310VgnVCM10000081c7b10aRCRD&detailChannelGUID=f9835645aa79f310VgnVCM10000081c7b10aRCRD


Good luck!

Offline ajohnson

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Re: RFS7000 - AP652x MTU?
« Reply #2 on: January 15, 2014, 05:21:18 PM »
That document you referenced also says you can go to "Configuration -> Devices -> Mint Policy" and set it there, which I went to do, but it's already 1500.  1472 is 1500 - overhead so that should work, but I'm seeing 1655 frames in my capture.  Something's up or I'm not looking at my capture right...

Offline noobie

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Re: RFS7000 - AP652x MTU?
« Reply #3 on: January 15, 2014, 05:24:10 PM »
Exactly, default is 1500, but your SP (or whatever else on the way) will allow up to 1472 max, so make it lower