On Sat, 16 Oct 2010 20:11:46 +0100, Adam Hardy wrote: > 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 208.245.107.9 > > works fine, no packet loss ever. > > ping -s 1473 www.bbc.co.uk > > works fine too. > > ping -s 1473 208.245.107.9 > > results in 100% packet loss.
It can be a black hole router. Most firewalls block pings that send packets bigger than normal (32-64 bytes) to avoid "ping of death" and "blocking icmp fragment". > I have a bizarre problem with the server at 208.245.107.9, which is an > internet broker whose server keeps disconnecting when making data > requests. Their support is blaming the problem on me. I cannot load that site (208.245.107.9) on a web browser :-? s...@stt008:~$ host 208.245.107.9 9.107.245.208.in-addr.arpa domain name pointer mktgw1.ibllc.com. And by its name, seems like a gateway. > 208.245.107.9 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? You can try by reducing your MTU to 1400. Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.10.17.12.02...@gmail.com
