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evan18h
Tux's lil' helper
Joined: 02 Dec 2004
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 Posted: Mon Mar 07, 2005 5:47 pm Post subject: Port Triggering Question |
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My ISP blocks port 80, and I need to use that port for my webserver. I'd rather not switch to say port 81, so i found that my router has port triggering (http://en.wikipedia.org/wiki/Port_triggering) .... my question is can I use port triggering to take the incoming port 80 request and switch it to port 81 later so i can bypass any blocking?
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db_404
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Joined: 05 Dec 2002
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| Posted: Mon Mar 07, 2005 7:14 pm Post subject: Re: Port Triggering Question |
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| But if your ISP is blocking port 80 inbound, the packet destined for your router's port 80 to activate the trigger will never get there. |
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evan18h
Tux's lil' helper
Joined: 02 Dec 2004
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| Posted: Mon Mar 07, 2005 7:31 pm Post subject: Re: Port Triggering Question |
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| db_404 wrote: | | But if your ISP is blocking port 80 inbound, the packet destined for your router's port 80 to activate the trigger will never get there. |
I know...but wouldn't it make more sense for them just to block the outbound? if they blocked inbound port 80 then you
wouldn't be able to view other sites...unless i'm thinking about it backwards.
anyways does anyone have any ideas on this method or some other way
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db_404
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| Posted: Mon Mar 07, 2005 9:01 pm Post subject: |
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If you cannot conenct to a web server running on your machine, then the ISP is blocking inbound port 80 - you can still browse as when you connect to a webserver you connect to port 80 - the port that you receive packets back from the web server will be some high (>1024) port.
I don't think there is anything that can be done to get around the ISP block without involving another server that isn't blocked to redirect or mask a connection back to your server (running on an unfiltered port). There are some services from places like dyndns http://www.dyndns.org/ that could help do this. |
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Genone
Retired Dev
Joined: 14 Mar 2003
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Location: beyond the rim
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| Posted: Tue Mar 08, 2005 6:22 am Post subject: |
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First you should clarify what you want to achieve:
a) run your webserver on port 80 instead of 81
or
b) allow people to access your server with http://your.server.domain
Normally those two are the same thing, but they don't have to be. Option a) isn't really a problem, just need a few iptables commands on the server, option b) is trickier (you need some url forwarding from an external site). |
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evan18h
Tux's lil' helper
Joined: 02 Dec 2004
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| Posted: Tue Mar 08, 2005 7:18 am Post subject: |
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I have a domain which is pointing at my home webserver...i would like to make it bypass any port 80 blocks set by my ISP...
thats basically it... thanks to db_404 for the suggestion .. but its too bad dyndns.org doesn't provide what i need for free.
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