Cattle is a general networking error, indicating that you are having difficulty maintaining a connection to Destiny.
I'd advise a look over of the general networking guide:
https://www.bungie.net/en/Support/Troubleshoot?oid=12915
If you have multiple consoles on the same network, be careful about port forwarding. Doing so may prioritize all traffic to the console forwarded to, at the expense of any other consoles on the network.
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Could multiple devices on the same Internet cause this too?
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[quote]Could multiple devices on the same Internet cause this too?[/quote] Absolutely - running multiple devices at the same time means the devices are sharing bandwidth. If there isn't enough to go around, you may see disconnection issues.