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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: PPPOE, MTU, and boom.
>I have confirmed that when I block all ICMP to/from a website, we cannot >browse that site -- which is somewhat obivious. The question is, how, as >an internet community as a whole, do we fix this? > >Seems to me that most people using PPPOE would have a problem here. Or, am >I alone? > >My testing has been limited to Win2k, but I've heard similar reports on >WinME, 98, etc. We've come across this too, and spent quite a while diagnosing. The problem exists wherever there's an MTU reduction, and is caused by a combination of ICMP filtering (breaks PMTUD), and Microsoft's attempt at PMTUD (they just set the DF bit on all packets and expect to get an ICMP reply back if the packet is too large). Simon -- Simon Lockhart | Tel: +44 (0)1737 839676 Internet Engineering Manager | Fax: +44 (0)1737 839516 BBC Internet Services | Email: [email protected] Kingswood Warren,Tadworth,Surrey,UK | URL: http://support.bbc.co.uk/
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