MacBook Pro, Netcomm NB7Plus4W and Renewing DHCP Lease + Airport Express

Problem 1 - Internet Connection Problem
I am in a locatation with:
2 x Late 2011 Macbook Pros 0sX 10.7.3
1 X Mid 2010 Macbook Pro Osx 10.6.x
3 x iPhone 4 iOs5.x
1 x PC Windows XP
ADSL2 internet connection
Wireless Netcomm NB7Plus4W
The 2 x Macbook Pro's 0sX 10.7.3 have difficuly connecting to the internet after wake from sleep, restart etc. They connect to the wireless network okay however they are very slow to get online, usually about 3-5 minutes minimum. Usually what is required is openening System Prefs / Network / and renewing the DHCP lease, which reduces the Internet connection time by a couple of minutes.
Other devices connect okay.
Problem 2 - Airport Express extending wirelss network
I would like to add an airport express to the wireless network so music can be played through iTunes to a coneected sound system, however the instructions in Airport Express Help do not seem to work.
Thanks for your replies in advance
Christo

I don't think it can be a Leopard-specific issue, or even a MacBook or Airport one, 'cause I've been having the exact same problem for several weeks on my old G4 tower running 10.4.11 & connected by ethernet to a NetGear router. :\ In all user accounts it opens a few web pages then loses connection until I renew the DHCP lease - strangely, this seems to happen quicker while using Safari than Firefox, but that could be coincidental. When the G4 has lost its connection, both my 3G iPhone and my boyfriend's POS Dell laptop have no trouble connecting wirelessly.
I plan to try BDAqua's hardware test suggestion as soon as I have time to hunt for my Tiger install disks. Any other suggestions would be appreciated.

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Thanks for the response,
1. I live in Atlanta, close enough to an Apple store. But I just know that going there will probably mean I'll have to get the logic board replaced.
2. The only thing I noticed before the first USB port started acting funny was that my battery status changed to "Service Battery". I plan on replacing it this week too.
3. Nope only difference is that my battery drains kind of fast. After about 3-4 hours of my normal usuage with it (Internet, music, videos, and sometimes using Logic) it will be time to hook up the charger.
Would replacing the battery do anything? I'm not thinking it would but figure it'd be worth a shot since I've got to replace it anyway.
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I too noticed that most people who had this problem had some version of OSX 10.8.x

Continually have to renew DHCP lease

Occasionally my MBP will loose wireless connection. It often happens when my phone accesses the wireless Linksys router.
Every time it happens, I open network preferences, go to Advanced and "Renew DHCP Lease" and it fixes it.
Almost looks like I could use a script or something to make it renew DHCP lease when wireless disconnects.
Any ideas?

BoyHowdyDoo wrote:
Try another router. They are cheap.
I guess they're cheap for most people who are happy overspending for Apple products.
Usually not a problem with your Mac.
None of my other non-Apple devices have any problem connecting.
I really appreciate you being one of the few trying to help. My negative comments come from my frustration at Apple.

TS1388 After one or two websites the search "freezes". To rectify this I need to go into "Network" and press "Renew DHCP Lease" on my imac 10.6.8

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Hi all,
MacBook Pro 15" purchased in Februrary 2008, currently running 10.5.5, up-to-date with patches as of yesterday, 10/20/2008.
For a few weeks now, I've been consistently unable to connect to wireless networks (secured or unsecured, public or private) after changing networks (i.e. going from home to a coffee shop).
I have control over my home network router, and its logs show that upon connecting to the network, OS X tries to renew a DHCP lease for the previous network it was on. Upon receiving the "bad network" DHCP reply, instead of releasing the lease and obtaining a new one, the AirPort interface is immediately assigned an IPV4LL address (from 169.254.0.0/16) and no combination of changing network settings, changing AirPort settings, or rebooting will eliminate the old DHCP lease.
The end result is that my MBP is entirely nonfunctional on some wireless networks that other clients (both Windows and Mac) seem to have no trouble accessing. The problem is quite annoying because I can't connect to access points that (previously) worked fine and whose configurations haven't changed.
In any case where this problem occurs, an old DHCP lease for a different network (10.0.0.0/8 when trying to get on 192.168.0.0/24 or vice versa) is present, so I strongly suspect a DHCP problem. In all cases, I have perfect connectivity to the access point itself, so problems with the wireless connection parameters (including encryption), or those troublesome problems with 802.11b/g/n interoperation seem highly unlikely.
One of two things would help me:
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2) If this is really how the DHCP client is behaving, change the DHCP client so that upon receiving the "Bad network" response, it releases (or simply abandons) the lease and obtains a new one, rather than immediately assigning an IPV4LL address to the AirPort interface.
Additionally, is there any documentation on the Apple DHCP client? Under Linux, I could alter dhcpcd parameters to diagnose things like this. I could find no documentation about the Apple DHCP client outside of Mac Help, which wasn't really any help in this case.
Finally, I do not suspect that this is an instance of the problem discussed in http://discussions.apple.com/thread.jspa?threadID=1352518&tstart=0 as my connection is rock-solid if it can get an IP address when it connects. I've never even seen it hiccup.
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Open your network preferences, select 'airport' and advanced. Delete unused networks. Select your network.
Open TCP/IP and write down all the settings, configure iPv4 manually. Enter the settings manually. Turn off IpV6.
Open DNS and write down your DNS server. Delete it and re-enter it manually.
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I have had wireless problems intermittently for a year, and seriously for 6 weeks. Apple denied the issue and was no help in spite of many tens of thousands of people on their own discussions complaining. I found a post suggesting a couple of things which fixed the problem. I don't know if both are necessary, but the first by itself does not solve the problem.
Lock the channel of your router to channel 1, apparently Apple and 802.11n don't play well together on higher channels. When this becomes a standard this will be resolved I hope.
Open your network preferences, select 'airport' and advanced. Delete unused networks. Select your network.
Open TCP/IP and write down all the settings, configure iPv4 manually. Enter the settings manually. Turn off IpV6.
Open DNS and write down your DNS server. Delete it and re-enter it manually.
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If have the following problem
I us apple Airport extreme to connect to internet.
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Wonder why Apple hasn't chimed in on this one...
Whenever you have an issue like this where it's fine, then DHCP stops working for any reason.... Reset the PRAM.
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Extending the lease time is a bandage on the problem, and it is what we have done while I attempt to resolve the issue.
The network group would like the lease time set to 4 hours.
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