[MLB-WIRELESS] MW Intranet DNS & Redirection

Ryan Abbenhuys sneeze at alphalink.com.au
Thu Nov 20 16:16:14 EST 2003

Myself and tyson had GHO up and resolving .mwn addresses on the wireless
network, and had AAF setup also resolving for .aaf.mwn and .mwn.
Plus AAF was also resolving real IP's via the DNS of my ISP.  A few of the
connections to me have just been using AAF's IP as their one and only DNS
for their dialup ISP's and all seems to be working ok.
...have a slight feeling I may have broken something in the past few weeks
though.  haven't really looked at it.

I have some *draft* melbwireless DNS guidelines I'm going to run past the
committee before running past the members. I'll also arrange to get some
trial DNS servers up to see how this works.  In theory it should be ok as I
think it's pretty much the same setup that WAfreenet are using and as far
as I know theirs works well.

>> -----Original Message-----
>> From: Dan Flett [mailto:conhoolio at hotmail.com]
>> Sent: Thursday, 20 November 2003 15:05
>> To: Melbourne Wirless
>> Subject: [MLB-WIRELESS] MW Intranet DNS & Redirection
>> On a related topic, I run an access point at my node with 
>> DHCP.  From looking at the leases log I see that I get the 
>> occasional visitor assocating with my AP.  I'm pretty sure 
>> that these visitors are either my neighbors' home computers 
>> associating by accident, or wardrivers looking for Internet 
>> and home networks to probe.  I'm thinking that once they 
>> associate, they probably think they have Internet access.  So 
>> when they're connected they're going to type something like 
>"www.google.com" into their browsers.  And they're going to get a 404
>Actually, they won't.  They'll get the "Host can't be found" page, unless
>you have DNS working
>Is there some way to redirect these requests to my local web page at
> or any other web page of my choosing?  All these chance
>associations that people are having with my AP are a great chance to
>the word about Melbourne Wireless and the network.  But I don't think any
>them are going to go to the trouble of looking at the default gateway that
>my DHCP gives them and then typing that address into their browser. 
>of a 404 I want them to see a web page that explains why they're not
>Google and tells them what the Melbourne Wireless Intranet is.
>The answer is "it depends".  If they can resolve an IP address (any old IP
>address will do), and you have a Linux (or *BSD) web server sitting
>somewhere on the default route from the client network, you can do it.
>Simply run a copy of Apache as you normally would.  Make both indec.html
>the 404 error document the page you want to show the user, and finally,
>setup transparent proxying in iptables (or equiv), so all port 80 requests
>not destined for 10.x.x.x are redirected to the localhost.
>So, if DNS is working and external addresses can be resolved, yes you can
>it, but if DNS is not working, it's not gonna be so easy.  You could try a
>bogus DNS server with wildcard records for .com, .org, etc, all pointing
>your web server. :)
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