Symptom
When the wireless client session is first established we see the correct subnet mask, router address and DHCP lease time on the DHCP Offer/Ack sent to the client.
Once the mag binding refresh time expires, the mipv6 binding update/ack is successful, however we see the WLC sending DHCP ACK packet to client with subnet mask 0.0.0.0 router address 0.0.0.0 and lease time 0 seconds.
This results in repeated mipv6 binding refreshes and cilent won't have network connectivity anymore.
Conditions
5520 WLC running 8.5.135.0 acting as MAG.
CSR1000v router as LMA.
Workaround
Extend binding refresh time (i.e, DHCP lease time)
or
Remove client session from MAG (WLC) and start new client session.
