Scheduled re-routing via router

[illDecree]

anyone have any idea how to schedule all traffic (mainly port 80) to redirect ?

ie: rather than simply use a schedule to cut off access, i'd like to route to a page during set times that gives a description of why the connection isn't working.

almost like a 'walledgarden' state, but on a schedule

i'm running DD-WRT mega, btw

[sc302 Veteran]

you would have to be able to reroute the error code like you can in iis (custom error codes ftw). being that the firware is doing the rerouting, it would have to be done within the firmware.

[TGT]

From what I understood, you want traffic (presumably outside, internet traffic) redirected to another server (or port on the same server) at specific times?

One way this could be accomplished is through Destination NAT and iptables. Since you're using DD-WRT, you basically have a Linux box capable of doing these things for you ;).

telnet into your router and issue a command similar to the following:

iptables -t nat -A PREROUTING -d 192.168.1.1 -p tcp --dport 80 -m time --timestart 00:00 --timestop 08:00 --days Mon,Tue,Wed,Thu,Fri -j DNAT --to-destination 192.168.1.2:8080

This iptables rule will catch packets coming into the network (from the internet for example) and "re-route" the packet accordingly.

"-d 192.168.1.1" would be the destination address of your web server.

"--dport 80" is the port the web server is listening on (port 80)

"-m time" sets up a rule to look at time and date - configure "--timestart", "--timestop" and "--days" to your needs

"-j DNAT" tells the router what to do when a match is found (in this case, preform a Destination NAT)

and finally,

"--to-destination 192.168.1.2:8080" is the re-directed location and port you want the traffic to go to instead.

Now, the above is a very crude example of how you could do this with iptables. I'm pretty sure there are others here that have a far superior understanding and can chime in with something more elegant.

Also, given the nature of routing and switching, the above iptable rule may not work for computers if they are on the same LAN segment as the webserver (since computers on the LAN will be switched instead of routed).

Also, visit DD-WRT - Iptables for a brief guide on further use of iptables. Learn the basic commands and toy around with it until it works to your liking.

Good luck!

Edited November 24, 2009 by TGT

[illDecree]

Thanks TGT!

I'm sure that would work, but i'm unsure of if i want to set up a dedicated server. i know i could run one off of dd-wrt to display a single page, but the other problem is this also needs to be done at another location on a router that doesn't support DD-WRT

I'm trying to help my cousin cut off WAN access daily. right now he's got a schedule in his router that just stops it altogether. we were thinking it would be nice to have a 404-like page come up when you try to attempt to access WAN during this time frame. he runs a wifi hotspot and people all the time complain that 'it's not working' because they are unaware there is a time frame involved.

it's too small of a hotspot to use sputnik or wifidog.... although, it might end up going that way before too long. i like to keep it simple for now, at least