Messages in this thread | | | From | Ricky Beam <> | Subject | Re: [2.1.91-pre1] tcp wierdness and lockup | Date | Sun, 29 Mar 1998 03:32:55 -0500 (EST) |
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Letting the chips fall where they may, I quote Alan Cox: >> I have a friend that logs into my machine from a local ISP. >> This ISP doesn't allow ping packets (perhaps any icmp, not sure?). > >In which case he will not be able to use the internet. He should change >provider immediately to an internet provider instead.
Blocking ping's I can understand, but point-blank no ICMP?
>> logged in. However, after that, anything that requires a lot of output >> (more than a few lines) locks his connection up hard. >> (ls -la, xemacs, etc...) > >This is bcause they have blocked ICMP. You cannot block all ICMP. Fortunately >this ISP will go out of business when Win98 comes out as it uses MTU >discovery and lower MTU's on slower links.
I wish I could impress this point on our network technicians... ICMP is there for _a_ _reason_. Turning it off will cause all kinds of problems. That's exactly like turning off TCP.
--Ricky
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