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**Snowhog** · Jul 17, 2011, 03:34 PM

Re: WLAN0 will do reverse dns lookups but not forward

I'd agree, the router likely does not have a DNS identified, and it should have at least one (I have two).

**gtrip** · Jul 17, 2011, 04:00 PM

Re: WLAN0 will do reverse dns lookups but not forward

The router has 2 DNS servers... one local and one from the carrier.
Connecting to the router by dhcp creates the client's DNS server as being the router.

$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.0.1

I can create a manual connection and use the local DNS server with no change. All of this information has already been provided in the original post.

Reverse lookups, as is shown to be working, wouldn't happen if no DNS server was available.

Other computers connect using dhcp to the same router without fail. Ubuntu, Kubuntu and Fedora machines as well as any Windows machine.

This issue is also on the Ubuntu forum.
http://ubuntuforums.org/showthread.php?t=1806292

**Snowhog** · Jul 17, 2011, 04:02 PM

Re: WLAN0 will do reverse dns lookups but not forward

So to be clear: Lookups, both reverse and forward, work when you use the wired connection, but do not when you use your wireless connection, both of which are served by the same router?

**gtrip** · Jul 17, 2011, 04:38 PM

Re: WLAN0 will do reverse dns lookups but not forward

Originally posted by Snowhog

So to be clear: Lookups, both reverse and forward, work when you use the wired connection, but do not when you use your wireless connection, both of which are served by the same router?

Yes, that is correct.

**GreyGeek** · Jul 17, 2011, 06:55 PM

Re: WLAN0 will do reverse dns lookups but not forward

Your resolv.conf file is mis-configured. It holds your local IP address when it should be holding the primary and secondary DNS IP addresses of your ISP.

Here's mine:

cat /etc/resolv.conf
nameserver 207.69.188.186
nameserver 207.69.188.187
domain earthlink.net
search earthlink.net

My local IP address is 192.168.1.100.
The IP of my wireless router is 192.168.1.1

You appear to have the IP address of your wireless router in your resolv.conf file.

**Snowhog** · Jul 17, 2011, 07:32 PM

Re: WLAN0 will do reverse dns lookups but not forward

That is incorrect if you configure your router to include static DNS IPs, in which case your /etc/resolv.conf only needs your routers IP address. This is how my /etc/resolv.conf configured - it only contains my router IP address. I have none of the issues to OP is getting.

**gtrip** · Jul 17, 2011, 07:42 PM

Re: WLAN0 will do reverse dns lookups but not forward

Originally posted by GreyGeek

Your resolv.conf file is mis-configured. It holds your local IP address when it should be holding the primary and secondary DNS IP addresses of your ISP.

Here's mine:

cat /etc/resolv.conf
nameserver 207.69.188.186
nameserver 207.69.188.187
domain earthlink.net
search earthlink.net

My local IP address is 192.168.1.100.
The IP of my wireless router is 192.168.1.1

You appear to have the IP address of your wireless router in your resolv.conf file.

Here is the resolv.conf for a different computer that's connected to the same router and has worked perfectly for 18 months:
$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.0.1

I don't wish to have an optional default search or domain in resolv.conf.

The name server IS the router at 192.168.0.1 That router has multiple DNS server addresses that is uses to do lookups and passes the results back the to the client computer. As I said, I can manually put my local DNS server address in resolv.conf (at no successful change or result) OR can do an nslookup and tell that command to use any DNS server I wish.

However, after all of this has been said, no reverse resolution could be accomplished if there was no DNS server. The computer will succeed to do reverse DNS. I won't perform a forward lookup.
Thank you.

**Snowhog** · Jul 17, 2011, 08:01 PM

Re: WLAN0 will do reverse dns lookups but not forward

Something in your routers configuration isn't correct. That all works correctly from a wired connection but not from a wireless one suggests this to be true. How did you set up the router configuration with regard to DNS? Did you specify both static and dynamic DNS?

In my routers configuration (Linksys WRT54GL using Tomato Version 1.28 firmware) I have three Static DNS IPs (Basic > Network > LAN), and under DDNS (Advanced > DHCP / DNS) I'm using my ISP's IP address (Use WAN IP Address [recommended]) and None for each of the two Service entries.

**gtrip** · Jul 17, 2011, 08:33 PM

Re: WLAN0 will do reverse dns lookups but not forward

Originally posted by Snowhog

Something in your routers configuration isn't correct. That all works correctly from a wired connection but not from a wireless one suggests this to be true. How did you set up the router configuration with regard to DNS? Did you specify both static and dynamic DNS?

In my routers configuration (Linksys WRT54GL using Tomato Version 1.28 firmware) I have three Static DNS IPs (Basic > Network > LAN), and under DDNS (Advanced > DHCP / DNS) I'm using my ISP's IP address (Use WAN IP Address [recommended]) and None for each of the two Service entries.

I don't like to be redundant by copying and pasting from my above posts, but other computers connect using dhcp to the same router without fail. Ubuntu, Kubuntu and Fedora machines as well as any Windows machine. In fact, the computer that I'm currently using on this Kubuntu board is connected by wireless to the same router. This has all been stated in my original and subsequent posts.

**GreyGeek** · Jul 17, 2011, 09:46 PM

Re: WLAN0 will do reverse dns lookups but not forward

Originally posted by gtrip

..
The name server IS the router at 192.168.0.1 That router has multiple DNS server addresses that is uses to do lookups and passes the results back the to the client computer. ....

Which is the only place the IP of the ISP's DNS can be if they are not in resolv.conf. Did they get changed or over written?

**Snowhog** · Jul 17, 2011, 09:52 PM

Re: WLAN0 will do reverse dns lookups but not forward

Let's approach this from the "what network manager"are you using on the "problem" PC, and how is it configured for the wireless connection?

**gtrip** · Jul 18, 2011, 04:25 AM

Re: WLAN0 will do reverse dns lookups but not forward

The problem machine's IP address is 192.168.0.188. It's gateway is the router at 192.168.0.1. The DNS server is also the router. A client only needs one DNS address because if it's not connected to the router, it's not online anyway. The router has multiple DNS servers it uses to return an answer back to the client.

All of this has little matter since the resolv.conf is exactly the same as any other machine I have that successfully connects through that router.

This is as fresh of an install as can be of Kubuntu 11.01. What is loaded during the install and the updates immediately afterward is what's on that machine.7.

**gtrip** · Jul 20, 2011, 10:36 AM

Re: WLAN0 will do reverse dns lookups but not forward

*** SOLVED ***
Tenda W311U Wireless Adapter didn't work well with the DLINK DIR-625 wireless router's enabled settings of:

- Multicast Streams
- UPnP
- QOS Engine

Once these 3 items were disabled, forward and reverse DNS functioned and normal network traffic passed without fail. The Tenda WiFi adapter must be more sensitive than other adapters. Other computer's WiFi adapters never have had difficulties connecting to this DLINK router with these settings enabled as they were.

**GreyGeek** · Jul 20, 2011, 12:51 PM

Re: WLAN0 will do reverse dns lookups but not forward

Originally posted by Snowhog

That is incorrect if you configure your router to include static DNS IPs, in which case your /etc/resolv.conf only needs your routers IP address. This is how my /etc/resolv.conf configured - it only contains my router IP address. I have none of the issues to OP is getting.

I have my TP-LINK wireless router configured that way but resolv.conf is always given the settings I showed.

A property of the specific wireless router?

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