In article <20170811163021.gk7...@platypus.pepperfish.net>, Rob Kendrick <r...@netsurf-browser.org> wrote: > On Fri, Aug 11, 2017 at 05:16:09PM +0100, Dave Higton wrote: > > > > If anyone reading this thread can shed any light on MTU issues, how > > to diagnose them and how to fix them, it would be very helpful.
> Something that has bitten be before is where automatic path MTU > discovery does not work (and I suspect it doesn't on RISC OS), and your > ISP does not support end-to-end 1500 byte MTUs (many do not). > The solution is to set your whole LAN's MTU to 1400 or similar, > although setting it only on the RISC OS machines may be sufficient (and > not needed on VirtualAcorn because that proxies Windows's IP stack > which is full-featured and conforming) assuming the problem is only > sending large packets, not receiving them. I find it fascinating that my ISP's web support MTU is variously 1454, 1458, 1492 and 1500. This is dependent on hardware - the last one being a generic setting for 'none of the above routers'. Funny how the original 'net developers opted for and MTU of around 1500. Anyone who's had a computer for more than a few weeks ought to wonder why it's not 1024. -- Tim Hill timil.com : tjrh.eu : butterwick.eu : blue-bike.uk : youngtheatre.co.uk
