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my Linksys befsr41 and file transfer

Discussion in 'Networking (Hardware & Software)' started by uberclueless, 2003/05/14.

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  1. 2003/05/14
    uberclueless

    uberclueless Inactive Thread Starter

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    as posted in the subject, I have a Linksys befsr41 router (4 port)

    I have it hooked up to 2 computers.

    Ever since I set up this mini-network, I have been unable to send files via ICQ or MSN or just about anything I've tried.

    Is it because of the built in NAT firewall?

    or because it has something to do with my port forwarding/triggering?

    I've tried forwarding ports but I've had no luck.

    Any suggestions?
     
    Last edited: 2003/05/14
  2. 2003/05/14
    Newt

    Newt Inactive

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    "NAT firewall " is a bad label for Linksys to use. NAT (network address translation) does provide protection but is absolutely NOT a standard firewall where you have to deal with specific ports. If you want more info, do a search on here for NAT and you will find lots.

    "Port Forwarding" - based on the way NAT operates, any network communications started by one of your PCs (trying to send a file) should work fine without messing with any port forwarding. But if you intend to have others outside your local network starting up a conversation, you will have problems since NAT won't know which PC gets the inbound packets.

    When you set "port forwarding" you are instructing NAT that any inbound traffic addressed to a certain port (or range of ports) is to be sent to one of your PCs. But you have to pick one and it will get all that traffic.

    If you have a software firewall on either or both of your PCs (like the one that ships with XP), you'll have to so some modification to allow inbound packets. But you can send stuff out thru the XP style firewall easily.

    If none of this helps at all, post back with some detail about your network and the OS's your computers run.
     
    Newt,
    #2

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  4. 2003/05/15
    Scott Smith

    Scott Smith Inactive Alumni

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    One other way I have had some luck with it is temporarily put your machines IP in the "DMZ ".
    It's on the router config page, Advanced tab, DMZ Host.

    This is straight from MSN Messenger help:

     
  5. 2003/05/15
    BillyBob Lifetime Subscription

    BillyBob Inactive

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    Ever since I set up this mini-network, I have been unable to send files via ICQ or MSN or just about anything I've tried.

    Is this over the Network or the Internet.

    With the Router they should be separate.

    I have the same Router with 4 machines hooked up and have had no problem tranfering file over the Internet with ICQ.

    MSN I do not use.

    I can also transfer files between machines but that is using the LAN and not Internet.

    BillyBob
     
  6. 2003/05/15
    uberclueless

    uberclueless Inactive Thread Starter

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    This is over the internet, I can easily transfer between machines (at very high speeds) and even SEND files out...but receiving them I get nothing...on the ICQ transfer screen it will keep saying "listening" and no progress...however the timer keeps going up :eek: ...I'm pretty sure I have to open up ports that icq uses and I'm sure I've done it correctly but still nothing.
     
  7. 2003/05/23
    maggie

    maggie Inactive

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    I have the same router with the latest Firmware 1.44.2 I use msn 5 and I can transfer files over the internet. I don't have any port forwarding or DMZ set up. The only thing I might have different is I have UPNP enabled in optional network components.
     
  8. 2003/05/23
    Newt

    Newt Inactive

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    "and even SEND files out...but receiving them I get nothing "
    That was the missing bit if information.

    For ICQ and similar traffic that is headed in to you but originating elsewhere (as opposed to a response to something you send), you will have to set up port forwarding on your Linksys router.

    And you will be limited to all ICQ or similar going to one specific PC on your network. When you set port forwarding, you instruct the router that all packets addressed to a particular port (or ports) be sent to a certain PC on your network.

    You'll also have to make sure that your PCs maintain the same IP address always. So static rather than DHCP assignment.

    The problem you have run in to is because of the way NAT (Network Address Translation) on your router works. When you start an internet conversation of any kind (browse to a web site, FTP, send ICQ messages, whatever) your packet is trapped by the NAT service and examined. Since your PCs have private IP addresses, the original address on the packet has to be changed before it can go anywhere and NAT does this. It will store packet information in it's database, change the IP address from yours to its, and send the packet.

    Return packets are examined and matched with a stored packet in the NAT dB. When a match is found, NAT will reverse the process by removing it's address, inserting yours, and sending you the packet.

    If no match (as there won't be if the packet isn't a response), it just discards the packet.

    Port forwarding simply instructs NAT to not look for a match but to simply alter the IP address and send the packet to the specified PC.
     
    Newt,
    #7
  9. 2003/05/23
    Train

    Train Inactive

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