RE: [WIRELESS-LAN] Odd issue with Aruba wireless...
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 ** 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. If you have received this message in error, please contact the sender by reply e-mail message and destroy all copies of the original message (including attachments). ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] 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 ** 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. If you have received this message in error, please contact the sender by reply e-mail message and destroy all copies of the original message (including attachments). ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Odd issue with Aruba wireless...
We have seen this issue lately as well, but we use Extreme wireless, Cisco Home wireless in the repair lab, and Ruckus. We went through the ideas of viruses, bots, worms, etc. This has occurred on two of our student's laptops. Exact same indications that you describe. We came to the conclusion that the ethernet controller had failed since the hardline indicated the same thing. We could put a USB wireless adapter on and successfully connect. Weird. This has only shown up on Win7 laptops. Harry Rauch Sr. Network Analyst Eckerd College 4200 - 54th Ave S St. Petersburg, FL 33711 On 12/7/11 2:36 PM, Jeff Kell wrote: 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/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Odd issue with Aruba wireless...
Client's ARP request obviously reaches its default-gateway, but the ARP response from the default-gateway is seemingly not reaching your client. Do a packet-capture on the client to confirm continuous ARP requests for default gateway with no responses. Then, mirror the port on the Aruba controller and see if the ARP response from the default gateway at least makes it that far. With those two data points, you should be able to continue tracing the path to determine where it is dropped. == Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu Submit a Kudos to an OCIO employee! On Dec 7, 2011, at 2:36 PM, Jeff Kell wrote: 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/. -- BEGIN-ANTISPAM-VOTING-LINKS -- Teach CanIt if this mail (ID 1303129320) is spam: Spam:https://antispam.osu.edu/b.php?i=1303129320m=00a414f6e771c=s Not spam:https://antispam.osu.edu/b.php?i=1303129320m=00a414f6e771c=n Forget vote: https://antispam.osu.edu/b.php?i=1303129320m=00a414f6e771c=f -- END-ANTISPAM-VOTING-LINKS ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Odd issue with Aruba wireless...
I just ran into a very similar problem and debugged it with Aruba support. Please check your user-table for the IP address of your server. (Aruba) #show user-table | include ip-address If you see an entry in the user-table check to see what role it is assigned. My SMTP server kept showing up and was being put into a role that would now allow SMTP communication. DOH! The fix is to add the ip address of the server to the validuser acl. configure terminal ip access-list session validuser host ip_address_of_server any any deny position 1 write memory This will modify the validuser acl and tell it not to add the IP address of your server to the user-table. Let me know if this fixes your problem also. Kade On 7 Dec 2011, at 2:18 PM, Ryan Holland wrote: Client's ARP request obviously reaches its default-gateway, but the ARP response from the default-gateway is seemingly not reaching your client. Do a packet-capture on the client to confirm continuous ARP requests for default gateway with no responses. Then, mirror the port on the Aruba controller and see if the ARP response from the default gateway at least makes it that far. With those two data points, you should be able to continue tracing the path to determine where it is dropped. == Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu Submit a Kudos to an OCIO employee! On Dec 7, 2011, at 2:36 PM, Jeff Kell wrote: 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/. -- BEGIN-ANTISPAM-VOTING-LINKS -- Teach CanIt if this mail (ID 1303129320) is spam: Spam:https://antispam.osu.edu/b.php?i=1303129320m=00a414f6e771c=s Not spam:https://antispam.osu.edu/b.php?i=1303129320m=00a414f6e771c=n Forget vote: https://antispam.osu.edu/b.php?i=1303129320m=00a414f6e771c=f -- END-ANTISPAM-VOTING-LINKS ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. Kade P. Cole - kc...@siue.edu - (618) 650-3377 Southern Illinois University Edwardsville - ITS Network and Infrastructure - Network Engineer III ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Odd issue with Aruba wireless...
That sounds like a firewall issue. Have you checked what role your users are being put into and what access it allows? We had problems early in our roll-out with users being dropped into a logon role, which is designed to give access only to the web portal service. -- Bruce A. Hudson | bruce.hud...@dal.ca ITS, Networks and Systems | Dalhousie University| Halifax, Nova Scotia, Canada| (902) 494-3405 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
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 ** 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. If you have received this message in error, please contact the sender by reply e-mail message and destroy all copies of the original message (including attachments). ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
