Re: Problem viewing some web pages

[Bulent Murtezaoglu <bm@acm.org>]

    JS> I had some really weird problem looking slightly similar to
    JS> your with another French ISP. After quite some time it
    JS> appeared that it had something to do with fragmented packets
    JS> being dropped for some reason I could never figure out (nor
    JS> could the ISP actually).  [...]

If that's the case then it was probably due to the interaction of 
path-mtu-discovery and inept router/firewall admin in the path.  
Path-mtu-discovery works by setting the don't fragment bit and 
relying on the routers' sending back ICMP "would fragment" (might not
be the exact message) messages as they drop the packet.  If somebody
blocks all ICMP messages in the path, packets will get dropped with no
indication as to why.

cheers,

BM