DHCP broken for Repeater Bridges in RC7

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f-win
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Joined: 15 Apr 2008
Posts: 12

PostPosted: Fri Apr 18, 2008 18:32    Post subject: DHCP broken for Repeater Bridges in RC7 Reply with quote
Hi guys,

DHCP is not working for my repeater bridges. I found a couple of threads were people are reporting the same issue but there does not seem to be any conclusion:

http://www.dd-wrt.com/phpBB2/viewtopic.php?t=30207&highlight=repeater+bridge+dhcp

http://www.dd-wrt.com/phpBB2/viewtopic.php?t=29902&highlight=repeater+bridge+dhcp

Do you think it is an configuration issue or do you think there might be a bug?

Thanks a lot!
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soulstace
DD-WRT Guru


Joined: 04 Aug 2007
Posts: 6427

PostPosted: Fri Apr 18, 2008 18:33    Post subject: Reply with quote
Yes, there is a bug on some routers.

But what router do you own?
f-win
DD-WRT Novice


Joined: 15 Apr 2008
Posts: 12

PostPosted: Fri Apr 18, 2008 19:21    Post subject: Reply with quote
I am using two repeaters:

AP is a Netgear router with stock firmware

1st repeater is a Linksys WRT54v3 (connected to the netgear)

2nd repeater is a Linksys WRT54GL (connected to the WRT54v3)

-Florian
f-win
DD-WRT Novice


Joined: 15 Apr 2008
Posts: 12

PostPosted: Fri Apr 18, 2008 21:34    Post subject: Reply with quote
Im using RC7-9346 (http://www.dd-wrt.com/dd-wrtv2/down.php?path=downloads%2Fothers%2Feko%2FRC7-9346/)

And the Netgear is a WGR614v6 with stock firmware version 2.0.19_1.0.19.

(Routing works fine though)
soulstace
DD-WRT Guru


Joined: 04 Aug 2007
Posts: 6427

PostPosted: Sat Apr 19, 2008 0:22    Post subject: Reply with quote
I'm not sure if chaining bridges will work.

Also, you might want to give VINT builds a try, if your router(s) have an older CPU.
f-win
DD-WRT Novice


Joined: 15 Apr 2008
Posts: 12

PostPosted: Sat Apr 19, 2008 0:39    Post subject: Reply with quote
I will try the VINT builds later.

The chaining of routers works from a IP routing point of view. All wireless clients have access to the internet. I am not sure if the chaining is really the issue for DHCP since even if a wireless client is connected to the first repeater (the one that is talking directly to the AP) the DHCP does not work. (DHCP clients are Mac laptops if that matters)

Thanks for your advise!
f-win
DD-WRT Novice


Joined: 15 Apr 2008
Posts: 12

PostPosted: Fri Apr 25, 2008 0:35    Post subject: Reply with quote
Unfortunately the latest VINT build does not fix the DHCP problem either.
LLigetfa
DD-WRT User


Joined: 23 Oct 2007
Posts: 406

PostPosted: Fri Apr 25, 2008 0:52    Post subject: Reply with quote
You mean Pre-RC7 since RC7 was just released today.
f-win
DD-WRT Novice


Joined: 15 Apr 2008
Posts: 12

PostPosted: Fri Apr 25, 2008 2:04    Post subject: Reply with quote
Yes you are right I am using the pre RC-7 9396M Eko VINT build. Any ideas?

Thanks!
Traulinger
DD-WRT Novice


Joined: 24 Apr 2008
Posts: 38

PostPosted: Fri Apr 25, 2008 7:13    Post subject: Same here as well... Reply with quote
I've been having the same problem as well. My AP router is a Netgear WGR614v7 with stock firmware and my other router is a Linksys WRT54GL 1.1 with v24 RC-7 04/11/08 std - build 9396M Eko.

The Linksys has 2 wired clients. They can both access the internet but only when assigned IP addresses manually in XP. Naturally this causes problems recognizing them in the AP router since they appear to be coming from the same mac address. (Windows is still able to recognize shared drives/printers/etc, however)

I know there have been numerous discussions about this issues especially as it referred to client bridge mode and the limitations of the 802.11 protocol, but I was under the impression that repeater bridge was supposed to address some of these issues. I would be interested to see others thoughts as well. It appears from the boards that several have gone through the setup as described but are still experiencing DHCP issues.

Casey
alain
DD-WRT Guru


Joined: 06 Jun 2006
Posts: 601

PostPosted: Fri Apr 25, 2008 10:47    Post subject: Reply with quote
I experienced the same problem when i did test repeater bridge.
Clients never obtained a dhcp lease.
redhawk0
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Joined: 04 Jan 2007
Posts: 11563
Location: Wherever the wind blows- North America

PostPosted: Fri Apr 25, 2008 12:02    Post subject: Reply with quote
I just posted a response here

http://www.dd-wrt.com/phpBB2/viewtopic.php?t=30927

A repeater Bridge MUST connect to a DHCP serving router.

redhawk

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LLigetfa
DD-WRT User


Joined: 23 Oct 2007
Posts: 406

PostPosted: Fri Apr 25, 2008 12:11    Post subject: Reply with quote
f-win wrote:
Any ideas?
Yes, edit your title to say pre or the build number. Now that there is a real RC7, people will be looking for posts on the real RC7.
redhawk0
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Joined: 04 Jan 2007
Posts: 11563
Location: Wherever the wind blows- North America

PostPosted: Fri Apr 25, 2008 12:22    Post subject: Reply with quote
It really doesn't matter. All Pre-RC7's and the RC7 official worked for Repeater modes. It was fixed in one of the Post-RC6.2 builds.

redhawk

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The only stupid question....is the unasked one.
alain
DD-WRT Guru


Joined: 06 Jun 2006
Posts: 601

PostPosted: Fri Apr 25, 2008 14:36    Post subject: Reply with quote
Quote:
A repeater Bridge MUST connect to a DHCP serving router

So in my opinion this is a bug.
It should also be possible to have a different DHCP server in the network.
The wrt set to repeater bridge can obtain a dhcp lease from my dhcp server, but clients connected to the repeater cannot obtain a lease.

What DHCP-Relay-Agent is being used?(dhcrelay?).

[EDIT]
just noticed that dhcrelay must be given the ip of dhcp server it forwards the requests to.
So, to fix this, it is necessary to first broadcast a DHCPINFORM, get the list of all dhcp servers, and start the dhcp forwarder with the correct dhcp servers.
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