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An MTU size of greater then 1470 on any of the computers meant that some packets (of this large size) wouldn't pass through the router. I check by pinging the router with randomly sized packets, and by trying to pass randomly generated packets through it. Only some web sites trigger the transfer of large packets.
The linksys router and D-link router were on loan for the day, don't have them anymore so I can't test them anymore. The problem existed on the linksys router, but I didn't pass packets through it, I fixed the problem on the Hawking router which is a very old discontinued model that I got cheap.
On the hawking router if I pinged or sent a packet of size 1480 or larger then the packet would not arrive or in the case of ping it would say something about fragmentation. When I set the MTU to 1470 all apps work fine.
The linksys router was what looks like a rather old single port model.
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