We had to get a little more granular in ours because we had user table entries with our gateway addresses get populated in the user table that caused outages in those network segments. Yes, that's right, there was a client MAC address with an gateway IP address that brought down that network segment. Uggh. Be careful and inclusive when setting this up!
Colleen Szymanik Sr. Network Engineer ISC Networking & Telecommunications University of Pennsylvania From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Ryan Holland Sent: Friday, December 09, 2011 11:32 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Odd issue with Aruba wireless... If I may stem off Stan's post, please plan well if you also have remote APs. The remote AP is a VPN user first and requires specific policies in the 'validuser' ACL as well. In addition to DHCP, Secure PAPI, NAT-T, and L2TP could also be required. ========== Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland....@osu.edu<mailto:holland....@osu.edu> Submit a Kudos to an OCIO employee!<http://www.surveygizmo.com/s/514095/giveociokudos> On Dec 9, 2011, at 11:09 AM, Brooks, Stan wrote: 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<mailto:wlans...@hotmail.com> GoogleTalk: wlans...@gmail.com<mailto:wlans...@gmail.com> ________________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] on behalf of Osborne, Bruce W [bosbo...@liberty.edu<mailto:bosbo...@liberty.edu>] Sent: Friday, December 09, 2011 8:04 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto: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]<mailto:[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]<mailto:[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<mailto: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<mailto:wlans...@hotmail.com> GoogleTalk: wlans...@gmail.com<mailto:wlans...@gmail.com> ________________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] on behalf of Jeff Kell [jeff-k...@utc.edu<mailto:jeff-k...@utc.edu>] Sent: Wednesday, December 07, 2011 2:36 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto: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 ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ________________________________ This e-mail message (including any attachments) is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this message (including any attachments) is strictly prohibited. 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