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Re: ping packet loss when size gt 1500

Anticept . on 16/10/10 21:20, wrote:
On Sat, Oct 16, 2010 at 3:11 PM, Adam Hardy <adam.ant@cyberspaceroad.com> wrote:
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?

Use OpenDNS or google DNS. Don't rely on your ISP DNS, as most of them
don't know how to run them very well.

Also, if British Telecom uses PPPoE, you can't have a packet size over
1492 (MTU size). 1500 is standard on non-PPPoE connections. It's not
really an issue at all, just means you will need to transfer a tiny
few packets more (you won't notice). In fact, if you are indeed using
PPPoE, it would be good to make sure your MTU size is set to 1492 so
your router won't have to fragment it to transmit.

It's a PPPoA connection so I guess that doesn't apply.


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