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Wireless networking woes

 
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Zebu Fellenz



Joined: 21 Dec 2006
Posts: 2567


Posted: Sun Nov 29, 2009 10:58 pm    Post subject: Wireless networking woes

Here's a problem for you experts to figure out for me. Thumbs Up

We have a wireless network in the house with a few PC's and my iMac connected. I am using an Airport Extreme to extend this wireless network to the shop where the HTPC and theater are.

It is "somewhat working" I can get on the HTPC and see the other computers in the house, running Windows 7, or Windows XP, I can also see my iMac. I can access these machines fine from the HTPC but there is no Internet connection on the HTPC, anyone have any guesses as to what could be going on?

I have a Thinkpad with XP on it also in the theater. I will try this and see if the result is any different.

Thanks,

Erik
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zaphod



Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale

Posted: Sun Nov 29, 2009 11:08 pm    Post subject:

sounds like routing. you can reach the other machines in your house because they are on your local network. but you don't have the correct gateway set to let your HTPC reach other machines outside your house.

if, in a CMD window, you type the command "ipconfig" you should see a default gateway set.

Quote:
C:\Documents and Settings\zaphod>ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : lydia.org
IP Address. . . . . . . . . . . . : 192.168.1.19
Subnet Mask . . . . . . . . . . . : 255.255.255.
Default Gateway . . . . . . . . . : 192.168.1.1


without that default gateway set correctly, you are hooped. because you can see the machines in your other house, you should be able to see the gateway. on one of your house computers, use ipconfig to show their default computer. now on the HTPC, see if you can reach it with the ping command.

Quote:
C:\Documents and Settings\zaphod>ping 192.168.1.1

Pinging 192.168.1.1 with 32 bytes of data:

Reply from 192.168.1.1: bytes=32 time=1ms TTL=150
Reply from 192.168.1.1: bytes=32 time=1ms TTL=150
Reply from 192.168.1.1: bytes=32 time=1ms TTL=150
Reply from 192.168.1.1: bytes=32 time<1ms TTL=150

Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms


if you can reach that gateway from the HTPC, then set the gateway to that machine and you will reach the outside world.

what i'm suspecting is that the airport express is not acting as a fully transparent bridge and your gateway is being set to that airport express. just a guess not look at your network, but if you can reach one set of computers and not the internet, then there is a routing issue. and if that machine is connected via a switch, it's an interesting thought that this extra machine is setting a different gateway for that machine.
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Zebu Fellenz



Joined: 21 Dec 2006
Posts: 2567


Posted: Mon Nov 30, 2009 12:40 am    Post subject:

Zaphod,

I just tried what you suggested.

The gateway is 192.168.1.1 and if I ping it from a PC inside the house it works fine, doing the same thing in the shop comes up with a time out, and a 100% loss of data sent.

However when I do the "ipconfig" on a PC in the shop the gateway comes up as 192.126.1.1 just like it does in the house, it just fails when I try to ping it.

Any ideas on what I can do to resolve this? I will be trenching in a ethernet line this fall, but would like to get something working until the hard line goes in.

Thanks,

Erik
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zaphod



Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale

Posted: Mon Nov 30, 2009 2:18 am    Post subject:

hey Erik,

hmmmm, is there a typo there? you said that the gw is 192.168.1.1 in the house and 192.126.1.1 in the shop

the 192.126.X.X is a different network that 192.168.X.X and that might explain some things...

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walk gently. leave a good impression.
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zaphod



Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale

Posted: Mon Nov 30, 2009 2:40 am    Post subject:

okay, i've tried to find the docs on the apple site and like i suspected, the airport can hand out IP addresses (is a DHCP server).

if there is no typo above, then what i suspect is that you have two networks - one is on the apple side that gives out addresses in the 192.126.X.X range and then the other set of addresses (192.168.X.X) in the house.

the airport, is attached to both networks. 1) it's own wireless net and 2) the house network it's plugged into

so, since the airport sees both networks, it will bridge the two and let the info move between the two. but the airport itself cannot reach the outside world because it does not have a gateway set. because it can't see the internet, neither can stuff on the wireless net.

how to solve? i'd start by turning off the DHCP services on the airport or your other DHCP server. one server is going to get one network across the house and the shop.

if that doesn't work, i'd try to get a gateway set on the airport.

both of these solutions require that you get onto the gui of the airport.

the last thing i'd try is to get a Dlink or linksys WAP, plug it into the network and away you go Smile



now a lot of this is conjecture, based on what you described, the 2 different net numbers and what i gleened from the minimal docs that apple has on the web site, and not having my sticky claws actually on the network... Smile

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walk gently. leave a good impression.
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Zebu Fellenz



Joined: 21 Dec 2006
Posts: 2567


Posted: Mon Nov 30, 2009 4:11 am    Post subject:

zaphod wrote:
hey Erik,

hmmmm, is there a typo there? you said that the gw is 192.168.1.1 in the house and 192.126.1.1 in the shop

the 192.126.X.X is a different network that 192.168.X.X and that might explain some things...


Oops that is a typo... Embarassed

It is 192.168.1.1 at both locations.

Sorry about that
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zaphod



Joined: 16 Jun 2006
Posts: 2002
Location: Cloverdale

Posted: Mon Nov 30, 2009 5:20 pm    Post subject:

well, that blows that theory Smile but i would still check the airport express settings for those things - only 1 dhcp server on your net and is it a bridge or a router? if the airport is a router then you need to set the gateway on the shop PC to be the airport.
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