RE: Aruba user-table and split DHCP scopes
I've seen the issue with pooling and without. It's cropped up only on Android and IOS devices so far. It appears to manifest after the device has awoken from deep sleep or if the wifi adapter was disabled and re-enabled. The device will pick up the first DHCP offer it sees even if it already has a leased IP on the other server. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Colleen Szymanik [c...@isc.upenn.edu] Sent: Friday, July 27, 2012 12:47 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes We have a similar setup (split DHCP scopes) running AOS 6.1.3.2 without major issue. We've seen some intermittent client connectivity issues, mostly from Macs, but nothing wide scale & they aren't specific to our AOS version. Are you using vlan pooling? We aren't & I was trying to see what the differences are. Colleen Szymanik --- University of Pennsylvania On Jul 27, 2012, at 9:40 AM, "Kellogg, Brian D." mailto:bkell...@sbu.edu>> wrote: We are just installing our new Aruba wireless stuff and have run into an issue caused by split DHCP scopes. We split our scopes in half between two DHCP servers for redundancy. What happens is the Aruba user-table will get two entries in it due to the fact that whichever DHCP server responds first wins. When this happens the clients will get intermittent connectivity issues if they can connect at all. We are running ArubaOS 6.1.3.3. I’ve done split scopes for years without issue. Just wondering if anyone else has run into this and if there is a fix without abandoning split scopes? Thanks, Brian ** 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: Aruba user-table and split DHCP scopes
Now once the entry times out of the user-table, in 5 minutes by default, the client is then ok. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Kellogg, Brian D. Sent: Friday, July 27, 2012 12:48 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes I've seen the issue with pooling and without. It's cropped up only on Android and IOS devices so far. It appears to manifest after the device has awoken from deep sleep or if the wifi adapter was disabled and re-enabled. The device will pick up the first DHCP offer it sees even if it already has a leased IP on the other server. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Colleen Szymanik [c...@isc.upenn.edu] Sent: Friday, July 27, 2012 12:47 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes We have a similar setup (split DHCP scopes) running AOS 6.1.3.2 without major issue. We've seen some intermittent client connectivity issues, mostly from Macs, but nothing wide scale & they aren't specific to our AOS version. Are you using vlan pooling? We aren't & I was trying to see what the differences are. Colleen Szymanik --- University of Pennsylvania On Jul 27, 2012, at 9:40 AM, "Kellogg, Brian D." mailto:bkell...@sbu.edu>> wrote: We are just installing our new Aruba wireless stuff and have run into an issue caused by split DHCP scopes. We split our scopes in half between two DHCP servers for redundancy. What happens is the Aruba user-table will get two entries in it due to the fact that whichever DHCP server responds first wins. When this happens the clients will get intermittent connectivity issues if they can connect at all. We are running ArubaOS 6.1.3.3. I’ve done split scopes for years without issue. Just wondering if anyone else has run into this and if there is a fix without abandoning split scopes? Thanks, Brian ** 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/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: Aruba user-table and split DHCP scopes
I have seen this on our Aruba controllers here. A client is shown with two entries, with the same MAC address, authentication, and duration, but with IP addresses from different scopes. This was one of several issues with the controller web interface that I've reported to them -- they weren't very helpful. I don't have reports that users experience connectivity issues when this happens, but they probably should... For a while I kept manual records, trying to see if the problem was limited to specific kinds of clients. I never saw that it was -- sooner or later, every common type of client encountered this situation. David Gillett CISSP CCNP From: Kellogg, Brian D. [bkell...@sbu.edu] Sent: Friday, July 27, 2012 9:48 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Aruba user-table and split DHCP scopes I've seen the issue with pooling and without. It's cropped up only on Android and IOS devices so far. It appears to manifest after the device has awoken from deep sleep or if the wifi adapter was disabled and re-enabled. The device will pick up the first DHCP offer it sees even if it already has a leased IP on the other server. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Colleen Szymanik [c...@isc.upenn.edu] Sent: Friday, July 27, 2012 12:47 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes We have a similar setup (split DHCP scopes) running AOS 6.1.3.2 without major issue. We've seen some intermittent client connectivity issues, mostly from Macs, but nothing wide scale & they aren't specific to our AOS version. Are you using vlan pooling? We aren't & I was trying to see what the differences are. Colleen Szymanik --- University of Pennsylvania On Jul 27, 2012, at 9:40 AM, "Kellogg, Brian D." mailto:bkell...@sbu.edu>> wrote: We are just installing our new Aruba wireless stuff and have run into an issue caused by split DHCP scopes. We split our scopes in half between two DHCP servers for redundancy. What happens is the Aruba user-table will get two entries in it due to the fact that whichever DHCP server responds first wins. When this happens the clients will get intermittent connectivity issues if they can connect at all. We are running ArubaOS 6.1.3.3. I’ve done split scopes for years without issue. Just wondering if anyone else has run into this and if there is a fix without abandoning split scopes? Thanks, Brian ** 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/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: Aruba user-table and split DHCP scopes
Yeah, it's probably the clients that initiate power save mode more often that will see the issue first and more frequently. For now we stopped doing split scopes for our Aruba client VLANs in order to avoid this issue. -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of David Gillett Sent: Friday, July 27, 2012 12:58 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes I have seen this on our Aruba controllers here. A client is shown with two entries, with the same MAC address, authentication, and duration, but with IP addresses from different scopes. This was one of several issues with the controller web interface that I've reported to them -- they weren't very helpful. I don't have reports that users experience connectivity issues when this happens, but they probably should... For a while I kept manual records, trying to see if the problem was limited to specific kinds of clients. I never saw that it was -- sooner or later, every common type of client encountered this situation. David Gillett CISSP CCNP From: Kellogg, Brian D. [bkell...@sbu.edu] Sent: Friday, July 27, 2012 9:48 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Aruba user-table and split DHCP scopes I've seen the issue with pooling and without. It's cropped up only on Android and IOS devices so far. It appears to manifest after the device has awoken from deep sleep or if the wifi adapter was disabled and re-enabled. The device will pick up the first DHCP offer it sees even if it already has a leased IP on the other server. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Colleen Szymanik [c...@isc.upenn.edu] Sent: Friday, July 27, 2012 12:47 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes We have a similar setup (split DHCP scopes) running AOS 6.1.3.2 without major issue. We've seen some intermittent client connectivity issues, mostly from Macs, but nothing wide scale & they aren't specific to our AOS version. Are you using vlan pooling? We aren't & I was trying to see what the differences are. Colleen Szymanik --- University of Pennsylvania On Jul 27, 2012, at 9:40 AM, "Kellogg, Brian D." mailto:bkell...@sbu.edu>> wrote: We are just installing our new Aruba wireless stuff and have run into an issue caused by split DHCP scopes. We split our scopes in half between two DHCP servers for redundancy. What happens is the Aruba user-table will get two entries in it due to the fact that whichever DHCP server responds first wins. When this happens the clients will get intermittent connectivity issues if they can connect at all. We are running ArubaOS 6.1.3.3. I've done split scopes for years without issue. Just wondering if anyone else has run into this and if there is a fix without abandoning split scopes? Thanks, Brian ** 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/. ** 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: Aruba user-table and split DHCP scopes
I am aware of the Mac client hiberation issue and not getting a DHCP address. I believe if you press Aruba, you can get a cbuild to fix (since they are aware of the open issue as well). It should be released GD soon. Colleen Szymanik -- University of Pennsylvania Network Engineer From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Kellogg, Brian D. [bkell...@sbu.edu] Sent: Friday, July 27, 2012 1:24 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Aruba user-table and split DHCP scopes Yeah, it's probably the clients that initiate power save mode more often that will see the issue first and more frequently. For now we stopped doing split scopes for our Aruba client VLANs in order to avoid this issue. -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of David Gillett Sent: Friday, July 27, 2012 12:58 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes I have seen this on our Aruba controllers here. A client is shown with two entries, with the same MAC address, authentication, and duration, but with IP addresses from different scopes. This was one of several issues with the controller web interface that I've reported to them -- they weren't very helpful. I don't have reports that users experience connectivity issues when this happens, but they probably should... For a while I kept manual records, trying to see if the problem was limited to specific kinds of clients. I never saw that it was -- sooner or later, every common type of client encountered this situation. David Gillett CISSP CCNP From: Kellogg, Brian D. [bkell...@sbu.edu] Sent: Friday, July 27, 2012 9:48 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Aruba user-table and split DHCP scopes I've seen the issue with pooling and without. It's cropped up only on Android and IOS devices so far. It appears to manifest after the device has awoken from deep sleep or if the wifi adapter was disabled and re-enabled. The device will pick up the first DHCP offer it sees even if it already has a leased IP on the other server. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Colleen Szymanik [c...@isc.upenn.edu] Sent: Friday, July 27, 2012 12:47 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: Aruba user-table and split DHCP scopes We have a similar setup (split DHCP scopes) running AOS 6.1.3.2 without major issue. We've seen some intermittent client connectivity issues, mostly from Macs, but nothing wide scale & they aren't specific to our AOS version. Are you using vlan pooling? We aren't & I was trying to see what the differences are. Colleen Szymanik --- University of Pennsylvania On Jul 27, 2012, at 9:40 AM, "Kellogg, Brian D." mailto:bkell...@sbu.edu>> wrote: We are just installing our new Aruba wireless stuff and have run into an issue caused by split DHCP scopes. We split our scopes in half between two DHCP servers for redundancy. What happens is the Aruba user-table will get two entries in it due to the fact that whichever DHCP server responds first wins. When this happens the clients will get intermittent connectivity issues if they can connect at all. We are running ArubaOS 6.1.3.3. I've done split scopes for years without issue. Just wondering if anyone else has run into this and if there is a fix without abandoning split scopes? Thanks, Brian ** 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/. ** 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/.
