Mike I recently solved an issue a client had with a very similar setup and the same symptoms.
They had a very complex PBR setup and the unicasts in the renew process got misplaced . tis 11 aug. 2015 kl 00:40 skrev Mike <[email protected]>: > On 08/10/2015 12:37 PM, Gert Doering wrote: > > Hi, > > > > On Mon, Aug 10, 2015 at 06:31:16AM -0700, Mike wrote: > >> I've loaded SE7 and - suprise - same problem, so it's not fixed. I have > >> a directly connected device I can cause to refresh it's dhcp lease, and > >> sure enough, a refresh doesn't do it, but a reboot of that device which > >> casues a new round of dhcp discovery, does in fact work. A packet > >> capture seems to confirm the unicast case failing - a client with an > >> existing lease renewing will use unicast to the dhcp server, whereas a > >> client starting up will use broadcast to find servers, and both the > >> 'discover' and 'request' phases in that case are broadcast destination. > >> That was painful. > > Wild idea... put an ACL into place that will block the unicast renewal? > > > > gert > > > I had that idea too. Another idea was to see if there might be some way > to work with it... My dhcp model is one where the server is directly > connected to the vlans being served, but I recently made changes in the > direction of going to a full-on dhcp relay model instead where all > switches are doing that instead. The open question then is, does it work > correctly if the switch is acting as a dhcp relay? I unfortunately don't > have the equipment on standby to set up a lab and test this out (story > of my life), but if it worked then my problem would mostly be solved. > Another idea would be to see if I could configure the dhcp server to > just ignore unicast requests (easier than putting ACL's on the the > switches). > > Mike- > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
