FTP & Router Problems. Any Network Administrators?

[LarryXtreme]

I run an FTP server, and I've been trying to get my brother to connect to it. No matter how we try, we cannot get it to work. It looks like it is going to connect. It asks for login and password, and everything looks okay. But in the FINAL step, it just stalls and says connection failed (we tried FlashFXP and Internet Explorer).

We both have an SMC Barricade 4-Port Router. They have built in firewalls. That might be a problem, although I don't know why. Other people can connect to my server. I can connect to other people's servers as well. That leads me to believe that there is some kind of conflict between my router and his router? I know nothing about networks, so any help is greatly appreciated.

We tried setting FlashFXP to passive mode, but still didn't work. I tried fiddling with Serv-U/FlashFXP options, but still didn't work. Does it have anything to do with Proxy servers? Please let me know if more information is needed.

Once again, I appreciate any help. Thanks in advance

 

[Rifter]

has he tried other clients? can he telnet into the FTP server?

 

[Need4Speed]

your proplem lies in the fact that the IP addy is not being translated correctly. That is, you are both behind a router and when the server sends the IP information, it is sending the IP of the LAN and not that of the WAN. When the client gets this information it can't connect, since it is looking a non-routable IP.

Here is what you need to do:
See if your server has a passive mode setting ( i recommend G6) and set the passive ip to that which is assigned to your WAN.
Make sure that you forward enough passive ports to allow users to log on. each user will need 2 ports...thus if u plan on having 10 users you would need 20 ports...something like this 1024-1044 forwarded from the router to the server PC.
set the clients to logon using passive mode.

 

[Citadel535]

Wow. need4speed I envy your computer knowledge. Any advice on where to learn more of that good stuff?

 

[Need4Speed]

most of this stuff i learn through personal experience...and work. You can pick up allot of it here, but the more you work with this stuff, the more you will learn.

 

[LarryXtreme]

Thanks for everyone's help.

I did get my brother connected to my computer, but I had to enter my computer as a DMZ host, which means that I demilitarize my computer and make it susceptible to hackers.

Does anyone know how I can allow my brother to connect without demilitarizing my computer?

 

[homaryu]

Undemilitarize your pute.

1.Put static ip on your NIC.(outside of your DHCP server IP's range).
2.Gateway would be your router IP(internal).
3.Use Serve-U(try ports 26000 range)
4.On your router use port forwarding(IP would be the static IP pute) port=26000.(in Virtual Server options)
5. Restart Router and bingo.

 

[DANNY61902]

<< your proplem lies in the fact that the IP addy is not being translated correctly. That is, you are both behind a router and when the server sends the IP information, it is sending the IP of the LAN and not that of the WAN. When the client gets this information it can't connect, since it is looking a non-routable IP.

Here is what you need to do:
See if your server has a passive mode setting ( i recommend G6) and set the passive ip to that which is assigned to your WAN.
Make sure that you forward enough passive ports to allow users to log on. each user will need 2 ports...thus if u plan on having 10 users you would need 20 ports...something like this 1024-1044 forwarded from the router to the server PC.
set the clients to logon using passive mode. >>



n4s.. are you assuming that this guys router isnt using port fwding already? larry said he tried pasv, but it didnt work..

 

[Need4Speed]

turning on passive alone doesn't do anything if the router isnt set up correctly to forward the passive range of ports. this is why it worked for him when the router was in the dmz. in passive mode, ports are assigned dynamically...in port mode the data port is control port -1...that is 21 and 20 for standrad ports. passive mode is like this: control port (ex. 666) and a range of port xxxx-xxxx for data ports. if u only open 6666 on the router, the data ports can't get through.