On 05/08/2014 08:51 AM, Edward Ned Harvey (blu) wrote: >> From: [email protected] [mailto:discuss- >> [email protected]] On Behalf Of Tom Metro >> >> Comcast Business cable Internet > I have used Comcast Business, and I'm the same as you - I would love to avoid > using any of those companies ever again, but *especially* comcast, based on > this experience. > > We had a satellite office, and we had Comcast Business cable in there, as > well as a T1. We needed to ssh from the home office into the firewall of the > satellite office, but it wasn't working. We traced it down: If you try to > connect to port 22 of the external IP of the comcast business IP address, > then the packet never reaches the destination. But if you ssh to the T1 IP > address, traffic gets through just fine. This proved that comcast was > blocking inbound port 22, and *not* a failure of the sending side to send the > traffic. We hooked up packet sniffers on both the sending side, and each of > the receiving sides, and saw the packets go out from the home office, > destined to each the comcast IP and the T1 IP. We saw the packets arrive on > the T1, but not comcast. Other types of traffic worked fine. It was only > port 22 that was blocked. I seem to recall we couldn't change the ssh listen > port, because it was a PIX or something, but that particular detail is cloudy > now. (T > his happened about 5 years ago.) > > Could not possibly be any more definitive proof that comcast was blocking > port 22. > > Comcast denied it despite hours on the phone with them. Problem was never > resolved. > _______________________________________________ > I don't have Comcast business class at home, but I do have Comcast residential. I use a different port number for SSH and it works reasonably well. But, on my tests, port 22 has also worked.
-- Jerry Feldman <[email protected]> Boston Linux and Unix PGP key id:3BC1EB90 PGP Key fingerprint: 49E2 C52A FC5A A31F 8D66 C0AF 7CEA 30FC 3BC1 EB90
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