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ping packet loss when size gt 1500

I thought I knew enough to keep my own home LAN going but I'm stuck on this one and I can't work out what to do next. In fact I thought everything was fine until I tried pinging with big packet sizes.

ping -s 1472 www.bbc.co.uk
ping -s 1472

works fine, no packet loss ever.

ping -s 1473 www.bbc.co.uk

works fine too.

ping -s 1473

results in 100% packet loss.

I have a bizarre problem with the server at, which is an internet broker whose server keeps disconnecting when making data requests. Their support is blaming the problem on me. is used by a huge number of clients and I apparently am the only one suffering.

Could it be something on my LAN? Or could it be my ISP (British Telecom) whose DNS server will randomly go down for a while and then come back (not in sync with the appearance of this problem though) - I thought I'd state that to give an idea of the ISP's reliability.

Or is this ping problem definitely something I can sort out and perhaps solve it?


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