Re: Port 25, 80 & 8080 Blocked / How to Work-around?
From:Date: 09/12/02
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Date: 12 Sep 2002 03:39:11 GMT
in comp.security.firewalls i read:
>If my cable modem ISP decides to block port 25, 80, & 8080, how do I run my
>web server and SMTP mail? What are my options, both ethical and unethical,
>to get around this - using a cable modem and linksys router for the ISP
>connection on a W2k-IIS server?
you need to be clear about which directions these blocks with exist, or if
it will be both, which may mean you need to grill your isp for the needed
clarity. e.g., blocking outbound 80 or 8080 would prevent customers from
surfing the web, whereas blocking them inbound is a limp attempt to prevent
customers from running their own web servers (probably because their tos
prohibits it and they are beginning to see a lot of upstream traffic).
there may be reasons to block port 25 in either or both directions, e.g.,
spam prevention / detection. (i'm sort of surprised that they don't intend
to block 1080 too.)
ethical: obtain e-mail and web service from another provider, though you
could not use that provider's smtp server to relay your traffic. that
caveat isn't usually a show-stopper; typically you can continue to use
whatever e-mail address you desire but sending through your isp's smtp
server. some isp's also require that you use the e-mail address that they
issued to you, in which case you would have to use the reply-to header and
it would expose your isp e-mail address.
unethical: http on some port other than 80 or 8080 (which is trivial since
it's part of the url you publish) or via a redirection service, smtp via an
external relay (via a tunnel or alternate port).
-- bringing you boring signatures for 17 years
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