Green light, network recognized, still no internet access

Hi all,
After a day of tinkering with my new AEBS 802.11n, I finally got the network up and running, after reinstalling the Airport Utility software and configuring the AEBS settings manually. Yay. But still, I can't get on line. There the AEBS sits, with its glowing green light taunting me, and my MacBook tells me I'm connected to my network, yet zip, nada, no internet access. I've tried unplugging and recycling the modem and the AEBS, separately and together, to no avail.
Does anyone have any advice?
Thanks! Kate

hi kate - oh, i had similar experiences (maybe have a look at http://discussions.apple.com/thread.jspa?threadID=1087373&tstart=0). so for me it looks like a tcp/ip address missmatch. do maybe the following:
check the modem/routers ip adress on the private side (not the public address on the dsl side). some hints to get this address if not available from the modem/routers manufacturer:
- connect the modem/router using an ethernet cable (mine is yellow) directly to your computer
- open safari and enter the address 192.168.1.1 (if you have a netopia modem or 192.168.0.1 if you have a netgear modem or the address of your specific modem/router .... ... right, that's the address you should look for )
- if you have found the right address the a message will follow that you should enter the modem/routers userid and password mostly "admin" and "1234"
- you will get the modem/routers menue where you can select somewhere "status" and you can verify the address. and ensure the modem/router is set to "DHCP" and look for both DNS address entries. these addresses you should set in your airport extreme
- disconnect the yellow cable. and a good idea is to fully restart your computer afterthat
but the main stuff from this story is, that you have to get somehow the ip adresse from your modem/router for your private network side. assuming now it's 192.168.0.1. so open airport utility, doubleclick on the airport extreme icon and select the internet icon.
- then set the addressing mode from dhcp to manual
- set the ip adress of the airport to 192.168.0.255 (this address is out of the DHCP-range)
- set the network mask to 255.255.255.0
- set the routers address to 192.168.0.1
- set the dns-entries to the addresses you have found in the modem status
- i m not sure if it's really necessary, but i have also set the ip address range for its distribution to 192.168.0.10 - 200 (the airport extreme should not make address distribution, because the modem/router is doing that ... but anyway)
- reconfigure and restart the airport
- open in the systems menue from your computer (i don't know the english name of the main mac configuration tool ...), open network, go the tcp/ip and renew the DCHP-lease (also your computer must get a new valid ip adress)
- open safari and then you should come to the internet ...
hope this helps

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    I appears your ACL 101 that filters traffic entering the Fa0/1.20 is not correctly written to allow DHCP requests to be processed by the router. The attempt has been made - but it is not correct. In particular, check out the second entry in the ACL 101:
    access-list 101 permit udp any host 10.27.131.8 eq bootps
    It allows all DHCP messages that are already targeted to 10.27.131.8, the DHCP server. However, such targeted DHCP messages may be used by clients only after they know who the DHCP server is in the first place. Until then, the requests are targeted to 255.255.255.255 and sourced from 0.0.0.0. Such packets are not allowed by any entry in the ACL 101 and are therefore dropped even before the DHCP Relay Agent can process them. That would explain why your clients actually cannot obtain IP address via DHCP in VLAN 20.
    We need to add the following entry immediately before or after the existing second entry in the ACL 101:
    access-list 101 permit udp any host 255.255.255.255 eq bootps
    You may accomplish this by the following sequence of commands directly pasted into the global configuration:
    ip access-list resequence 101 10 10
    ip access-list extended 101
    15 permit udp any host 255.255.255.255 eq bootps
    end
    The first line will cause the individual entries of the ACL 101 to be internally numbered, starting with the sequence number 10 and incrementing by 10 for each subsequent entry. The second line enters the ACL 101, treating it as a named ACL, allowing us to use the extended editing features. Finally, the third line starting with the sequence number 15 will cause the entry to be added between the existing first (seq no 10) and second (seq no 20) entry. It must be entered including the sequence number, otherwise the line will be added at the end of the ACL.
    Would you mind trying out this modification? The former corrections with the NAT I have described earlier must be applied as well.
    Best regards,
    Peter

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