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Vonage Folks seem to be forgetting that UDP is stateless. If you want to send a udp packet
Folks seem to be forgetting that UDP is stateless. If you want to send a udp packet to query the time, you have to open the return path to get the reply. The TCP concept of "server" doesn't really apply to UDP protocols.
Take an NTP query. The ATA sends a datagram out with a source port of 123 and a dest port of 123. The "server" replies by sending a datagram from itself at port 123 to your ATA at port 123. Hence you may have to open udp port 123 if you want to receive a reply. Note "may". Many routers have NAT heuristics to figure out that if a machine makes a ntp query on udp port 123, it will be expecting a reply and will automatically redirect it.
What bugs me though is the instructions that tell people to set their routers to forward *all* udp port 53 packets to the ATA. Say what??? If you follow those instructions, then the replies to the DNS queries from other machines to the ATA. Nothing else on the network will be able do lookups..
When I have one of these behind a router/firewall, I set up for DHCP and tell the ATA to make its DNS (port 53) queries to the router, which proxies the dns request. You shouldn't have to forward port 53 at all.
You do need TFTP though because that is how the ATA downloads its firmware updates, and I thought it was how it downloaded its configuration/provisioning file. If you dont allow it to do tftp (remember, udp - both directions!) then it can't update itself.
Anyway.. if you plug one of these devices in behind a UPnP-aware gateway, then the ATA will automatically configure the port forwarding and open the firewall holes silently without your knowledge.
This is why I hope I dont have to give up my motorola ATA and downgrade to a linksys for a while yet. It is sitting outside my router/firewall and operating as a switch (that reserves bandwidth for itself first) and I get to use my static IP's on the gateway and a couple of other machines I have. It has its own IP address and I dont have to mess with any port forwarding or the like. But the PAP2 doesn't have the dual ethernet ports needed for this.
Read The Full Thread: Required to open insecure ports ?!?
• LOL, check my sig. This is the first time I've ever been called a Vonage apologist.
You
• I couldn't find this anywhere else in the forums, so I'll start the thread. Since
• Who said you needed to open 53, 69 and 123?
• The instructions. :)
It's also in the Help section on the main Vonage site
• I did not have to forward any ports on my firewall to the Linksys ATA. Have you run
• Yes, I have. Speed doesn't seem to be the issue.
• Are you using Qos in the RT31P2? and on your Firewall? Have you tried to just use
• I don't have anything behind the phone adapter. No, I haven't tried testing without
• most people don't have to open ports because the connection is established by
• Which is funny, since you started this thread by saying:
So if you want to
peterwemm posted "Folks seem to be forgetting that UDP is stateless. If you want to send a udp packet" on 03/18/2005 |
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