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Forum Discussion
MR2100 - Need to Manually set MTU (due to PMTUD failure)
I've been trying out the 3 big LTE networks in the UK for comparison (EE, Three, Vodafone), I'm sticking with Vodafone which has the best reception in my area, and this is where the MTU problem sta...
tom- wrote:
Anyway, the MR2100 does not detect this, it only appears to attempt PMTUD upon the initial connection, and so of course all the connected devices will continue attempting to send 1500 for large enough packet... and you can probably guess what happens, things get flakey, website loading gets a bit annoying, HTTP requests that had a particularly big header will just vanish... uploading becomes almost unworkable.
This is clearly a probem with the (always ongoing) PMTUD: The last system, resp the IP stack on the Web server or the proxy/load balancer in the front of the Web server must realize that the packet is incomplete, ... Also http headers can be fragmented.