For all the Aruba users out there, I thought that a config example and
explanation fo the validuser ACL might be helpful. Here is the snippet of our
config (somewhat sanitized) for those that are interested:
netdestination validwirelessnetworks !# List your wireless client subnets here
network 10.16.0.0 255.255.0.0
network 10.18.0.0 255.255.0.0
!
netdestination arubacontrollers !# List your wireless controller mgmt addresses
or networks here
network <redacted>
!
ip access-list session validuser
any any svc-dhcp permit !# Needed for passing initial DHCP requests
alias validwirelessnetworks any any permit
!
Note there is an implied deny all after the last entry in the validuser ACL, so
anything not listed is denied. If you are using Mesh APs, you may need
additional statements to allow their traffic - talk with your Aruba Support
staff for details.
>>-> Stan Brooks - CWNA/CWSP
Emory University
University Technology Services
404.727.0226
AIM/Y!/Twitter: WLANstan
MSN: wlans...@hotmail.com
GoogleTalk: wlans...@gmail.com
________________________________________
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Osborne, Bruce W
[bosbo...@liberty.edu]
Sent: Friday, December 09, 2011 8:04 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Odd issue with Aruba wireless...
You really need to setup your validuser ACL. The default configuration is not
meant for a production environment.
We recently had an issue because our deny based validuser ACL had not been
updated when the network topology changed, adding additional subnets. some user
had our webmail server's address, so webmail did not work for user on that
wireless controller.
For the short term, we have added additional denies, but we will move to a
permit based validuser over Christmas break.
A permit based validuser ACL is Aruba's current recommendation.
Bruce Osborne
Network Engineer
IT Network Services
(434) 592-4229
LIBERTY UNIVERSITY
40 Years of Training Champions for Christ: 1971-2011
-----Original Message-----
From: Jeff Kell [mailto:jeff-k...@utc.edu]
Sent: Thursday, December 08, 2011 3:06 PM
Subject: Re: Odd issue with Aruba wireless...
Our "validuser" isn't customized (other than denying 169.254). We do not do a
lot of filtering, but were setup to suppress broadcast/multicast between
wireless clients (as you can probably tell, I'm not the Aruba detail
configuration wizard).
The final packet captures that helped identify the real issue were only seeing
broadcasts from the router, or broadcasts from the local client (ARPing the
router gateway address). It appears that the broadcast traffic that should
have been echoed out to the wired side simply stopped.
Jeff
On 12/8/2011 2:57 PM, Colleen Szymanik wrote:
> We saw similar issues. User table entries had usernames associated with our
> DNS servers. We did a great deal of debugging with traces, Aruba TAC and
> other customer discussions. We have validuser ACL entries setup to prevent
> all this. It seems that occasionally devices can echo packets and inject
> into the user table. Without protections such as validuser, it could cause
> connectivity issues depending on the role these entries receive. The
> cleanest thing we've seen done is to define variables with all your validuser
> entries as a white list and everything else should be denied.
>
> Colleen Szymanik
> Sr. Network Engineer
> ISC Networking & Telecommunications
> University of Pennsylvania
>
> -----Original Message-----
> From: The EDUCAUSE Wireless Issues Constituent Group Listserv
> [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Brooks, Stan
> Sent: Wednesday, December 07, 2011 3:45 PM
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> Subject: Re: [WIRELESS-LAN] Odd issue with Aruba wireless...
>
> Jeff -
>
> Besides the "only affects Win7" comment, this sounds like it could be an
> Aruba "validuser" ACL issue. If you've modified that ACL from the default of
> allow all IP addresses, it would block all but the specific allowed
> addresses. The symptoms are user gets a valid IP address from DHCP, then all
> their traffic it blocked because their IP is not in the validuser ACL. I get
> bit by that problem every time I add a subnet can forget to add it to the
> list of valid networks in our validuser ACL. Just a thought...
>
>>> -> Stan Brooks - CWNA/CWSP
> Emory University
> University Technology Services
> 404.727.0226
> AIM/Y!/Twitter: WLANstan
> MSN: wlans...@hotmail.com
> GoogleTalk: wlans...@gmail.com
>
> ________________________________________
> From: The EDUCAUSE Wireless Issues Constituent Group Listserv
> [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Jeff Kell
> [jeff-k...@utc.edu]
> Sent: Wednesday, December 07, 2011 2:36 PM
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> Subject: [WIRELESS-LAN] Odd issue with Aruba wireless...
>
> Having a strange issue with our wireless today... wondered if it rings any
> bells...
> seems to just be affecting Win7...
>
> Clients associate with access points fine, but shows "limited internet
> connectivity".
>
> Mouse-over wireless icon and it shows "unidentified network" (same in network
> and sharing center); although list of SSIDs shows the same expected SSID as
> Connected.
>
> Client RADIUS works fine (verified controller and radius server), dropped on
> production role.
>
> DHCP transaction is normal, request received and ACKed.
>
> Wireless router shows MAC address in expected vlan, and ARP entry shows
> expected IP address with the MAC.
>
> "ipconfig /all" shows correct IP, mask, gateway, DNS, and DHCP servers. No
> stray IPv6 or tunnel adapters.
>
> "route print" shows all expected correct entries for wireless. No stray IPv6
> (other than loopback and link-local). Default points to default gateway IP.
>
> "arp -a" does *NOT* show an entry for the default gateway, and client is
> unable to "ping" the default gateway.
>
> I'm baffled :)
>
> Jeff
>
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**********
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