I'm told that the dynamic interfaces, despite having IP addresses, aren't reliably pingable. They can "drop off" from ping (as I'm seeing) and to test whether it's really down, you have to ping an attached client (I'm not making this up). I'm also told that starting with 4.1.185.0, these interfaces can be considered trustworthy for ping-monitoring.
Lee H. Badman Wireless/Network Engineer Information Technology and Services Syracuse University 315 443-3003 -----Original Message----- From: John Watters [mailto:[EMAIL PROTECTED] Sent: Thursday, September 20, 2007 3:13 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] WiSM Interface Problem/Question I have seen this problem a couple of times, but it has disappeared before I could finish troubleshooting it. Please let me know what you find. -jcw > To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > From: Lee H Badman <[EMAIL PROTECTED]> > Date: Thu, 20 Sep 2007 12:39:30 -0400 > Subject: [WIRELESS-LAN] WiSM Interface Problem/Question > Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv > <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> > > Though I have not completely ruled out our network... > > I am seeing individual VLAN interfaces (these each get IP addresses) on > WiSMs that occasionally "fall off" - just stop responding. The net > effect is that a given SSID is still present for clients to attach to, > but the interface is gone, so there is no network usability. If I delete > and recreate the interface, functionality is instantly restored. (or if > the controller is rebooted). This is happening across three different > 6500's, several different WiSMs > > > Have ruled out duplicate IP addresses, and some ARP history is showing > two MAC addresses (same root MAC, last digit varies as is seen when MACs > are dynamically generated) for the same dynamic interface IP address, > and in some cases the same MAC is showing up for the AP manager > interface and the dynamic vlan interface. > > Not implying that all of this can't be explained, or that there is an > issue with the WiSMs- but wondering if anyone else has seen any similar > symptoms and found answers. Feel free to respond directly to me if you > prefer. > > Regards- > > Lee H. Badman > Wireless/Network Engineer > Information Technology and Services > Syracuse University > 315 443-3003 > > > ********** > Participation and subscription information for this EDUCAUSE Constituent Group discussion list > can be found at http://www.educause.edu/groups/. > ---------------------------------------------------------------- John Watters UA: Office of Information Technology 205-348-3992 ********** 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/.
