Currently facing a strange issue.
I'm connecting a Polycom Phone that is using a secondary role. The role has an Allow all rule.
The phone can connect to SIP and LDAP, but it fails to provision with HTTP. But if I connect it directly to the voice VLAN, without a secondary role, everything works.
Also, I can see the HTTP requests on my server, and it is answering back. The server itself can even contact the phone.
Any idea what can be messing with the HTTP traffic?
Do you have jumbo frames enabled between the switch, controller and every link/device in between?
The tunneling adds a GRE header which might result in the packet to be too large at some point in the path between controller and switch (or vice versa).
Setting the 7005 "Firewall MTU" seems to fix it.
Related to MTU:
- I'm using dynamic segmentation; the controller listen on VLAN 1001.
- I would like to use Jumbo from the switches to the controllers
- But the controller does not allow me to set the MTU of VLAN 1001 to more than 1500 bytes
Any idea why?
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