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MTU mismatch on one link
- Subject: MTU mismatch on one link
- From: mikea at mikea.ath.cx (Mike A)
- Date: Fri, 31 Aug 2012 09:03:03 -0500
- In-reply-to: <6E5736BD68F770449C74FBAD975F807C8E1D2BBE@NYDC-EXCH01.vinci-consulting-corp.local>
- References: <[email protected]> <6E5736BD68F770449C74FBAD975F807C8E1D2BBE@NYDC-EXCH01.vinci-consulting-corp.local>
On Fri, Aug 31, 2012 at 01:52:09PM +0000, Paul Vinciguerra wrote:
> You need to raise your MTU above that on the other side and do a ping size sweep. Unlike at Layer-3 when you can use set a DF bit and get back an ICMP error, at Layer-2 when you exceed the far side's MTU, the packets are silently dropped.
>
In the past, I've found a binary search on ping size to be very
efficient. YMMV, of course.
--
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin