UPDATE. I'm going a bit round the twist with this now, and the mirroring is not quite working for some strange reason.
- No traffic is being dropped at the AP or firewall level between the two subnets.
- No traffic is being NAT’d between the two subnets in either direction.
What we are seeing is the following.
- Sharing pictures to the AppleTV works.
- Sharing a youtube video to the AppleTV works.
- Mirroring from an iPhone to the AppleTV fails across vlans.
- Mirroring from an iPhone to the AppleTV works when on the same vlan.
- What we see on the device is that the mirroring button appears for a few seconds, then dissappears, then appears again and so on.
Doing a packet analysis, we found the following.
- The iPhone tries to establish a mirroring session which works up to the point when the device tries to setup an RTSP session.
- The AppleTV sends a ‘Sever 400 error’, which resets the connection and causes the mirroring to fail.
Given we can stream a Youtube video easily, it is rather frustrating.
Any suggestion greatly appreciated.