General :: Multiple Port Forwards With Same Router Ipaddress?
Aug 9, 2011
I have forwarded ssh and rdp protocols in the router which is in remote location. And i aslo configured dhcp reservation for my windows server's ipaddress. I have added that reserved ipaddress of windows server in the RDP port forwarding ip. And i connected to windows server through remote desktop with the ipaddress of the router because i needed a public ipaddress to connect. And now i am going to add my linux servers ip also to dhcp reservation and forward ssh port and give that reserved ipaddress. can i connect to linux server with same public ip that i used to connect for windows server?
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Nov 11, 2009
In a remote machine port 25 is open its enabled in firewall also...but not able to connect through telnet..why ?
netstat -an | grep 25
Code:
tcp 0 0 0.0.0.0:44525 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
[code]....
Code:
telnet 172.17.65.206 25
Trying 172.17.65.206...
telnet: connect to address 172.17.65.206: No route to host
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Mar 24, 2010
I have a CentOS5 box I use to run ASSP for Anti-spam. It has a single NIC. I configure network settings using Webmin. I have two Internet connections managed by different routers.
Router 1 - 10.0.0.254 255.255.255.0
Router 2 - 10.0.0.250 255.255.255.0
CentOS - 10.0.0.30 255.255.255.0
Both routers port forward traffic on port 25 (SMTP) to the CentOS box. The SMTP connections only work for the router that is the default gateway on the CentOS box! If Router 1 is configured as the default gateway in CentOS then I can Telnet to that routers WAN IP on port 25 and successfully send mail! On Router 2 I get no connection unless I change the default gateway in CentOS to be the IP of Router 2 thern Router 1 SMTP connections will not work! I imagine that CentOS is sending out it's responses to the default gateway instead of the Router that initiated the port forward?
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Sep 17, 2010
I have a device that must use a real IP address. Currently, my ISP uses DHCP and I can have up to 4 real IP address assigned. However, the cable modem only have 1 ethernet port and it's connected to my router (running Tomato, but can run DD-wrt or other Openwrt if required). Question stems from how I can connect the additional device, requiring a real IP? would be to get a switch and connect to the CM, Router, and Device. But alas, I want to avoid this route, since:
my wiring cabinet in my home is drawing lots of power and heat already Device will be unprotected by any firewall unable to monitor the traffic to/from device.Besides, what would be the FUN in that? what I want to do is to configure the router, so that one of the switchport is removed from the normal br0 bridge. Instead, I want to make it behave like a switch on the WAN port. What's the best way of doing this? Should I create another bridge on the WAN & the device port? Can a single port belongs to two bridges? or would I need to create a subinterface first? Would I need a DHCP-relay? Am I expecting too much from my poor cheapie router?
+------+
| CM |
+--++--+
||
+----WAN---------------+
[code]....
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Feb 9, 2011
Just setup an ssh server...kinda. I need to forward the port (22) through my router. I have forwarded ports before for programs so the whole thing isnt a mystery. But i need to know what to put in for a couple boxes.... Private ip: ? protocol type: tcp, udp, or both?
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Nov 20, 2010
When one should try to connect to port 3306 of particular ip here e.g. 345.56.67.87 it should be redirected to port 3306 of internal machine. This is the scene : How can I access the particular port of the machine which is behind the router . i.e. From out side internet I would like to connect to the port 21 of the machine (192.168.5.8) which is behind router (345.56.67.87) . Here are the details I tried : both side linux (centos)
1.enabled ip forwarding of router (345.56.67.87)
2.enabled ip forwarding of machine (192.168.5.8)
3.implemented some iptable rules: /sbin/iptables -t nat -A OUTPUT --dst 345.56.67.87-p tcp --dport 3306 -j DNAT --to-destination 192.168.5.8:3306
4.iptables -t nat -A OUTPUT --dst 345.56.67.87 -p tcp --dport 3306 -j DNAT--to-destination 192.168.5.8:3306
I tried to google on it mainly it dealt with the iptable rules. of which i applied but error is" can not connect to the port 3306 of 192.168.5.8"
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Feb 22, 2011
Say I have Computer A behind a router with NAT. I'm unable to add any port forwarding rules to that router. Then I have Computer B with a public IP address that I want to forward X windows from. This computer is headless, but does have a video card so X windows can be used. Here are some of the things I'd perform to setup my scenario.
1. Computer B, I'd run xhost + public_ip of NAT router.
2. Make sure that computer B's sshd service has X11 forwarding enabled.
3. SSH from Computer A to Computer B with the X windows forward option.
4. Once in Computer B, set the DISPLAY env variable to the public_ip of NAT router.
5. On Computer B run xclock.
At this point I'd expect to see an instance of xclock originating from Computer B onto my desktop. However this obviously won't work. The problem is that when the request is made to Computer B to forward the instance of xclock to Computer A the forwarded instance of xclock will get stuck at the NAT router. Without a port forwarding rule the NAT router will not know which internal IP to route the instance of xclock.
Here's my question. Is there any way for Computer A to initiate a connection to Computer B and then forward the instance of xclock? That way if it uses that same connection the NAT router will know which internal IP to route it to because it would be an active connection in the router's routing table. Or is there an alternative? Of course I can vnc into another computer outside the NAT network and then forward an X window to it just fine. But in the spirit of expanding my knowledge on X windows I'd like to see what is possible.
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Apr 7, 2011
In SuSE firewall0. I do have a openSuse 11.4 and multiple IP addresses on eth0 interface
I run (trying to/have to) multiple TOMCAT servers.
I am trying to have each tomcat instance listen to on separate IP address for example:
What i am trying to do is to redirect
a) tomcat 1 -
a) tomcat 2 -
And so on.
I know that it has to be possible.
I do have just eth0/
Is is it possible. Do I have to create "vittual interfaces"? eth0:1, .......... and do redirection ?
"Server" has got just single interface - just 1 ethernet calbe goes to that server. I am planning to have 10-15 tomcat's on that server (I have to unfortunatley) and each has to run on port 80
Is it possible to "grant" permissions to normal users to run app on port 80 - that would solve me lots of problems if impossible to redirect.
I tried to setcap 'cap_net_bind_service=+ep' /path/to/tomcat ...... but no luck
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Feb 18, 2010
A deamon say ssh will be listening on port 22. when a new connection is requested by the client, it will be authenticated and a new connection gets establihed with some port say 1025. And ssh will continue to listen on 22 for new connections.If I am correct then in my machine I observed following connections are establised to ssh port 22, As per my understanding connection should be established on a different port other than 22.
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Mar 6, 2011
Is there any limitation to the number of transactions through a single port if so then if we assign multiple port to that particular service then the performance is increased (what i suppose)
so: Is there any way to assign multiple Ports to a single service. like for a web server the main service is httpd or some thing like that to be running on the server and now if we assign multiple ports to that service then the performance increases.
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Feb 1, 2010
I was having trouble setting up a db connection from my local machine to a db server that was configured to only accept connections from machines behind its own subnet. I had trouble setting up a multiple hop tunnel for chaining port forwarding through my firewall machine on the same subnet as the db. My first attempt involved two port forwards, on localhost and on the firewall machine, which didn't work for me. This approach I found at URL... involved constructing an end to end connection to the db via the firewall machine.
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Apr 11, 2010
We are using squid proxy server for accessing Internet in RHEL4.
How to find out internet usage by ipaddress?
Is it possible in linux?
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Mar 25, 2010
How to find ipaddress of the device connected to the system.
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Mar 4, 2009
I have the wake on lan option enabled on my debian computer. If i wake it by sending:
-mac adres
-internal ip in my home network
-subnetmask
-port 7
It all works fine, but when i try to do it from outside my network and change the ip address to the router adress it wont go on. I have also opened the port 7 in my router.
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Aug 22, 2010
I have logged into my router and set up port-forwarding on port 22. I can log into the machine fine from a machine on the local network using the machines internal IP but when I try to log on from a remote machine using my router's external IP or my DyDNS host-name I get a message saying "connection refused" or "connection timed out." I have configured port-forwarding on the router and the firewall rules says that port 22 is open but when I nmap my routers external ip it says that only port 23 and 80 are open. I am very new to linux and networking.
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Dec 16, 2010
I have an n900 phone and I'm trying to ssh to my desktop but I'm getting an error:
ssh: connect to host 58.xx.xx.xx port 22: Connection refused
I recently started using a router for I wanted to connect to net even with n900. I've tried to open the port from the setup page of the router however it doesn't seem to work. (find below the screenshot of setup page).
I've tried to ssh through slackware I've got as a virtual machine and I have the same problem although I was able to ssh through slackware before I started using the router.
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Aug 1, 2009
This is possibly the so-manieth sound issue, but I couldn't find a solution just yet. I run F11 64bit, and have installed all codecs with Autoten. Now I run into the problem that at random intervals, music I play suddenly starts fast-forwarding (so playing at 5 times the speed). It starts fine, and then suddenly, after a couple of minutes, it goes weird. I haven't discovered any other symptoms yet.
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Jul 30, 2011
I'm curious is it possible to access your router settings. I'm trying to open up a port. I have done this in my firewall now I need to open up my port through my router. I'm using fedora 15.
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Apr 26, 2010
I'm running suse 11.1 which is configured as a router. Configured are two DSL connections with static IP's and one LAN connection (3 NIC's all together).
Problem: suse firewall will only port forward connections from one of the DSL connections and not the other.
Because I'm running two DSL connections is there something special I have to turn on/enable on the firewall?
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Aug 29, 2010
I'm trying to get my SSH server I set up on my home box working from behind a router. A 2wire 2700HG-B gateway, in fact. Now, I know my server is working fine, because I can get into it via loopback, anywhere inside the LAN from another machine, OR if I go into the router's config and enable DMZ for the machine. However, I don't like having DMZ on all the time because of the kludge-ness of it, and the security issue of the complete absence of a hardware firewall.If I try to port forward and access it from outside the LAN using the external IP (or my DynDNS, because it's dynamic), it just times out. I have a nonstandard port (45) for the listen port of the server, to keep away hack attempts if I were using the standard 22. I used this to see if the port was open, and it said it was. But, I tried the trick of telnetting the IP with that port, and it also timed out, instead of printing stuff about OpenSSH.
Attached is a screenie of my router's firewall page, so you all can look at it and see if I'm an idiot and doing it wrong. You might notice uTorrent there, it's because this machine is a dual-boot with 7, and the router doesn't differentiate the OS's. Also the SSH @ 46 port is for the Windows side, with freeSSHd. I changed the port on that one so the client I have can distinguish them, so it can run a reachability test.
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Aug 1, 2010
I enabled D-Link (DSL-502T) router web management (I am aware of security implication). I was able remotely to login to the router (by typing http://23.45.xx.6y) before changing the default number 80. Then I changed the port number from the default value 80 to 21908 (https option is not available) for better security, and when I tried to login to the router by typing this :
http://23.45.xx.6y:21908
Yes I am aware that if I am physically near to the router then I can check that , but this is not the case with me. How can I make sure that I had changed port number form 80 to 21908? Does NMAP do a trick to reveal which port is used for web management ? or are there other better options?
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Jan 26, 2010
I am trying to make a vnc connection from pc #2 to pc #1. Pc #1 is a debian pc behind a zyxel router (P-2602HW-D1A). Pc #2 is a windows xp pc another place at the internet.I have configured the zyxel router to forward incomming trafic on port 5902 to the local ip-adress of the debian box. The debian box is running a vnc server, listening on port 5902.But i dosn?t work.I have tryed to scan the zyxel routers ipadress on port 5902 from the internet, but the scanner says that the port is closed.The vnc server on pc #1 is working fine on the local network. I can connect to the server from a pc on the same side of the zyxel router.Is it deffenitly a router problem, or could it have something to do with debians own firewall?
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Jul 30, 2011
1. Need to connect 2 CCTV DVRs and view from remote. 2. Can get a static IP address. But I dont know if this is a secure way since any once can view if the know the ip address. 3. Question is : is it possible to connect the DVR( s) to a linux server which will get user name and password before letting us view the DVR. Currently there is one set as follows: 1. From location X a device is connected to location Y using leased line and static IP (12 kms distance). In location Y a router is placed and port forwarding is configured. From Location Z using internet and remote desktop concept the device at location X is viewed and data captured. Is it possible to use a similar concept but with some sort of security authentication procedure in place.
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May 27, 2011
Current: Workstation --> Wireless Router --> Cablemodem --> InternetsIPs:192.168.2.1 --> 192.168.2.5>192.168.1.5 --> 192.168.1.1>{someIP} --> InternetsSo my first link has a Class C of 192.168.2.0. I want to add a different class C also to that firstink of 192.168.3.0. The reason is my LAN traffic will be on 192.168.2.0 and traffic will be on 192.168.3.0.The wireless router can be only set up for one LAN IP, which is 192.168.2.5. Is there some way to set up a vpn or nat or bridge or something else so I can run two class C's to the router and it will pass them along? Router is the Netgear WNDR3700.
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Mar 1, 2010
I changed to a 4 port ethernet router (D-Link DSL-2542B Adsl2+)with intention to share Internet access with my brother (he's on Vista).Initially it all went well,but 3 days ago there were connection problems occured on the part of the ISP. Without realized the problem,I had reset the router.This morning I've been informed by the ISP that the connection has been re-established.So,I accessed the Internet via the 4 port router but failed to do so (server not found).Suspecting that the problem was from the 4 port router,I reverted to my old Adsl router (DSL-520B single port) and without any problem I managed to access the Internet back.I really need help to configure back the 4 port ethernet router to its initial state.
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Mar 12, 2010
how i can open port 4444 in my system and in the router of my ISP cuase i used it to download and i dont to be blocked from ISP
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Jul 8, 2010
I have a newer Belkin N+ router that has a USB port for accessing an external hard drive.I can access the HD with no problem in Windows.I am new to Linux/Ubuntu and cant seem to connect to the HD. In "Network" I have a folder "Windows Share" and within that folder is where I see the HD "CBHD" (name of my drive). I cant click it because when I do, i get an error message along the lines of (cant remember exactly right now) "Failed to mound"I typically access the drive in Windows via : \192.168.2.1
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Dec 19, 2010
I've recently been taking a look at my router settings and I've realized i have my vnc port open for some reason. I don't know how or why it got opened because I've only used vnc within my private lan. Anyway, the problem is I couldn't figure out how to close that port on my router, so I just uninstalled all the vnc software from my computer so it wouldn't act like a vnc server for anybody trying to access it from the outside. So, effectively, I cannot vnc into my computer from outside my private lan, but when i port scan my public ip, the vnc port still appears open.
I'm wondering if there's something i'm missing. I'm sure it must be something in the router that I haven't figured out... something that's keeping port 5900 open.
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Apr 10, 2010
I'm building a new router for my home. I have a pci-x motherboard with two network connections on the motherboard, SUSE 11. I intended to use one network connection for the external zone and the other for the Internal zone, (the internal port going to a four port switch). Recently, a friend gave me an "Intel PRO 1000 MT PCI-X Quad-Port Adapter C32199" which will plug into my motherboard, presumably giving me a total of 6 (4+2) network connections. 1) Can it be as simple as setting one network connection to "external zone" and the other five to "Internal zone", and plug my other computers into the internal zone connectors, eliminating the need for a switch?
2) There seem to be a lot of these QUAD server adapters on Ebay; how where they originally used?
3) Can I dedicate one internal net-port for some exclusive traffic (e.g. all mail, going to network connector 3, connected to the mail server)? IPtable rules?
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Nov 15, 2009
My computer is DMZ'ed ports forwarded and stuff, and still this port shows as closed on nmap.
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