WIndows7 and Echolink UDP Port Sttings

Discussion in 'Echolink/IRLP Tech Board' started by N8RT, Apr 12, 2010.

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  1. AB8ZL

    AB8ZL Ham Member QRZ Page

    Increasing the lease time isn’t the answer; you need to use a static address for the Echolink computer.

    You can setup the computer you use for Echolink to have a static address and still allow all the other computers to use DHCP. Some routers will assign a static address by MAC address, but if yours doesn’t you can set it up on the computer itself. Just pick an unused IP address outside of the range issued by the DHCP service of the router. Usually or are safe but you should be able to find where the routers DHCP range is set in its setup screens.

    Google for “setting up a static IP” for your specific OS.

    You will need to enter the IP address you want for the computer, a Subnet mask ( for almost all home routers), the Default Gateway (the address of your router, for most home routers), and your DNS servers. You can get the DNS servers by running “ipconfig /all” at a command prompt or use a set of public DNS servers (Googles are and and OpneDNS’s are and
  2. W7IMM

    W7IMM Ham Member QRZ Page


    I understand I need to use a static address on my laptop at home but will I need to reconfigure it for DHCP each time when I go on the road if I want to use Echolink on another network?
  3. AB8ZL

    AB8ZL Ham Member QRZ Page

    Well yes if you have to set it up on the computer you would have to switch back to DHCP to use the computer on other networks.

    It is best to setup static addresses on the router if the router allows for assigning static addresses by MAC address. Using Echolink on other networks usually isn’t an option as you don’t normally have access to the firewall port forwarding rules.

    Some routers allow you to setup port triggering; if yours has that option you may get Echolink to work with it which would allow you to use a dynamically assigned address with the router.
  4. W7IMM

    W7IMM Ham Member QRZ Page

    Thanks, I might look into that.

    It's a Linksys router. (My first router was an old AMD K6 computer running a "linux-router-on-a-floppy") It worked well but I never tried to set any sort of port forwarding.
  5. VA3CSS

    VA3CSS Ham Member QRZ Page

    Not at all.

    All DHCP servers have a lease time for IP addresses. What IP your ISP gives you is irrellevent. It does not affect your firewall settings for Echolink. Therefore, your router's lease time settings are the only ones that matter in this case.

    And as you already noted, a static IP address will only work if the computer never connects by any other means.
  6. W7IMM

    W7IMM Ham Member QRZ Page

    Yes, that's what I thought.

    I did not know that I could control the lease time the router assigns to each client on a LAN. If it gave each client a LONG lease time, it would effectively be giving each client a fixed IP address then? SO that if one client was disconnected for a time (less than the lease time) and reconnected it would get the same IP address back?
  7. VA3CSS

    VA3CSS Ham Member QRZ Page


    So long as that's an option in your particular router. Most recent models do support this. Some older ones do not, or may need a firmware update to add this.
  8. W4PG

    W4PG Super Moderator Lifetime Member 279 Volunteer Moderator Platinum Subscriber Life Member QRZ Page

    Are there any routers that how outbound protection? I have Zone Alarm on all my XP machines, but Windows 7 firewall has outbound protection that previous versions did not have. The last thing anyone wants is some Trojan sending out personal data from your computer to another.

  9. VA3CSS

    VA3CSS Ham Member QRZ Page

    In a manner of speaking, yes, some do.

    Some routers can block ALL traffic on a given port, so that would include outbound. The problem is... what port is that trojan you have using?? You'd have to know it.

    I suppose you can do what many do, which is to block all traffic on all ports, and open up only the ones you need for the programs you use. A cumbersome, and annoying method, but it does work - even if you don't know which port the trojan you just got is using.

    It also assumes that the trojan isn't capable of simply using any open port that it can find. There has to be one, since that's how you get the trojan to begin with. If it can "seek out" an open port to use, then the above method is rendered null and void.

    And yes, some trojans can do just that. We don't live in a perfect world, unfortunately.

    Also remember that it is assumed, (and I know, that's not a good word to use...) that the user of the computer is aware of the programs he / she is using that require access to the net. Hence, most routers don't use the "block everything except..." method I suggested above, just to prevent the angry calls to their tech support saying that they're switching to a different brand so that such-and-such program will work. They assume you'll know what you have.

    ZoneAlarm is, therefore, a handy tool when you're unsure, or suspect that something is up. If you're not that adept at computers, then programs like ZoneAlarm help to "cover your ass," as it were. ;)
  10. W7IMM

    W7IMM Ham Member QRZ Page


    Actually I did find a screen on the Linksys that allows a variable lease time (default 1 day) for DHCP assigned addresses.
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