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2 Messages
TV Interruptions While using Router as LAN Switch
I'm trying to set up a second router as a switch off of an ethernet cord that's coming straight from my AT&T router, so I can hardwire my computer and my At&t set top box. However after setting everything up the set top box keeps losing connection/timing out every 10 seconds on any channel. I don't get why this is happening since the PC has no issue with the connection and shows 300 mbps up and down. What settings should I mess with on my secondary router to stop this from happening?
Note: the cable from the router used to be for the set top box only, but it's just a normal ethernet so I don't see why this isn't working.
Note: the cable from the router used to be for the set top box only, but it's just a normal ethernet so I don't see why this isn't working.
Accepted Solution
Official Solution
JefferMC
ACE - Expert
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33.2K Messages
4 years ago
You cannot place a normally configured IP router between the AT&T Gateway and the AT&T TV Receivers. They communicate largely via multicast, and most consumer routers will not pass the multicast traffic, nor properly handle the IGMPv3 messages used to set up multicast subscriptions.
The 10 seconds of working, followed by it not working, is caused by the fact that when you tune a channel, the receiver receives a unicast stream with the content for 10 seconds while the IGMPv3 conversation is happening up stream to the AT&T Network equipment and the multicast starts. Normally, the receiver would begin receiving and switch to the multicast stream, but when it can't, the show stops.
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ATTHelp
Community Support
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221.6K Messages
4 years ago
Hey @pbrown39,
We'd like to help with your issue. The set top box is set up with High-bandwidth Digital Content Protection (HDCP). When unknown devices are used that are not HDCP licensed/certified, "handshake" issues can occur.
We suggest you look into HDCP to find out more information on it.
Max, AT&T Community Specialist
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