| Ben Love on 16 Dec 2009 19:41:59 -0800 |
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> There is what Lee said about the default hardware. It's also possible, > if not likely, that you need to tweak your network settings. Wired or > wireless? What FiOS hardware? One thing I have seen in the past (though very rarely) is an MTU problem. Ethernet (and the Internet at large) generally assumes a 1500 byte MTU. There are ICMP algorithms for path MTU discovery, but these are often broken because many routers block ICMP indiscriminantly. Sometimes FiOS or other providers will tunnel one ethernet connection through another. It's not common practice, but it does happen. This will shrink the MTU a little bit (to say 1452), and if you remember your networking class, the smallest MTU of any link in the path is the MTU of the entire path. Indeed, it can cause very strange packet fragmenting problems. (Here again, some routers refuse to fragment packets and forward each one.) This can often manifest itself as paused/timed-out connections, even to generic web pages. The solution to an MTU problem like this is to use iptables with the --clamp-mss-to-pmtu option: (something like this) $ iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN -o eth0 -j TCPMSS --clamp-mss-to-pmtu There's a little bit of information about it here: http://lartc.org/howto/lartc.cookbook.mtu-mss.html This is exactly how I solved a very similar problem with my FiOS connection. The symptoms included webpages failing to load properly or partially downloading. However, I've been told that using PPPoE like I do is not very common with FiOS anymore. Ben -- Ben Love blove+signature (at) kylimar.com || ASCII ribbon campaign - () http://www.kylimar.com/ || against HTML e-mail - /\ Attachment:
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