I have a linksys WRT54G wireless access point and I have't been able to get
voice communications using Windows Messenger or Buddy Talk. With a direct
PPOE connection to my isp they voice items worked fine. What ports need to
be forwarded to allow for voice?
On Fri, 08 Aug 2003 15:05:30 GMT, William Harper spoketh
>I have a linksys WRT54G wireless access point and I have't been able to get
>voice communications using Windows Messenger or Buddy Talk. With a direct
>PPOE connection to my isp they voice items worked fine. What ports need to
>be forwarded...Why is port forwarding more secure than opening up a port?
I have never understood this very well, here is my current grasp of it..
If I open up port 110 on my router:
1. If hacker is probing random IP addresses on that port, I will be flagged
as open and he will come back and pay me a visit.
2. Any Trojans, viruses, or other malware that works its way into PCs via
port 110 will eventually stumble across my open port and infect me.
Alternatively, if I "forward" port 110 to say 192.168.0.5 (my pop3 server
1. If hacker is probing random IP addresses on that port, will I will be
flagged as closed? stealthed? worth a second visit?...ssh port forward
Im trying to set up ssh local port forward.
But I dont know the ports to connect to on the remote machine
Is it possible to setup forward for a range of ports?
You can specify multiple ports to forward on the command line, or
establish a VPN if you have the need for UDP. See:
for info on both types.
On 21 Nov 2006 15:57:54 -0800
> Im trying to set up ssh local port forward.
> But I dont know the ports to connect to on the remote machine
> Is it possible to setup forward for a range of ports?
For UNIX, Linux and security articles
In article <firstname.lastname@example.org>
>Im trying to set up ssh local port forward.
>But I dont know the ports to connect to on the remote machine
You could perhaps use OpenSSH's "dynamic" port forwarding, i.e. SOCKS -
see the -D option.
>Is it possible to setup forward for a range of ports?
Not as such (with OpenSSH), though (with OpenSSH) you can AFAIK give any
number of -L options - i.e. a range is just a matter of giving one -L
option for every port in the range. A bit verbose, but the end result
would be the same - ssh (any flavour) would need to open a separate
socket for every port in the range, the...Prevent blocking remote port when setting up a SSH tunnel/SSH port forwarding?
Assume I create an SSH tunnel to a remote computer with
ssh foobar@remcomp -L 20110:remcomp:110
then it seems to me that on the remote computer port 110 is blocked for other
clients. Is this true?
How can I prevent this exclusive locking?
email@example.com (Peter Insold) writes:
> Assume I create an SSH tunnel to a remote computer with
> ssh foobar@remcomp -L 20110:remcomp:110
> then it seems to me that on the remote computer port 110 is blocked for other
> clients. Is this true?
Dag-Erling Smørgrav - firstname.lastname@example.org...Port Forwarding: Device:Port = Router:Port?
- Webcam's IP addr = 10.0.0.140, and it's set up to
use port 8000
- Router's IP addr = 220.127.116.11, and it's port forwarding is set
up to forward port 8000 to 10.0.140.
- I can view the camera using 10.0.0.140:8000, no problem.
The Question: Should I be able to view the camera using
On Wed, 31 Aug 2011 08:13:01 -0400, "(PeteCresswell)" <x@y.Invalid>
> - Webcam's IP addr = 10.0.0.140, and it's set up to
> use port 8000
> - Router's IP addr = 18.104.22.168, and...To Port Forward or Not To Port Forward
System: DP MDD G4, OS 10.4.9
Inet connection: DSL with static i.p.,Broadcom Gateway to Linksys
WRT54G Wireless Router using DHCP, 1 computer connected via enet, 3
connected wirelessly, basic home use only
Wireless security is very basic: Unique router name and pw, SSID
disabled, and connections allowed by MAC addresses only, Linksys
firewall is enabled with all the other features set to their defaults,
Mac OS firewall is disabled
I recently purchased a Logitec QuickCam Pro 5000 webcam that works just
fine with iChat right out of the box. Learning how to use it I found
some Apple docs and ot...port tunneling over ssh (not port-forwarding in the traditional sense)
Does anybody know of a way to do port forwarding over ssh not using the
standard ssh functionality, but rather by running a utility on the server
and using a special client that forwards data through the terminal session.
I think PPP and slirp would do the job, but I would prefer to have a
standalone client that exists solely to forward one (or several) ports,
rather than acting as my main network connection.
> Does anybody know of a way to do port forwarding over ssh not using the
> standard ssh functionality, but rather by running a utility on the server
> and using a spe...Ports for DB2 behind firewall / ssh port forward
I'd like to connect to a remote DB2 Database V 8.2 using the "DB2
Steuerzentrale" (I guess it's called something like "DB2 management console"
in the English version). Since the database host is behind a firewall I
tried to communicate through ssh port forwarding.
Therefore, I run:
ssh -L 6789:remotename:6789 -L 50000:remotename:50000 -L
50001:remotename:50001 -L 523:remotename:523 remotename
Though the ssh connection is established, my "DB2 Steuerzentrale" won't
connect to localhost successfully and shows an error num...FTP port forwarding in SSH.. Secure??
I was trying the "FTP Port Forwarding"
to secure the FTP transfer). I really like it, but I have a question:
On the unix manual pages (man ssh2), the description of the "-L"
option indicates that part of the connection is not secure when you
use FTP Port Forwarding, could someone please explain me what part is
not secure? Is it referring to the FTP data which is non-encrypted
inside the tunnel? Below is text from manual
page for F-Secure SSH2
ssh2 - secure shell client (remote login program)
-L [protocol/][localhost:]port:host:hostport or -L
The given port on the local (client) host is forwarded
to the given host and port on the remote side. This
allocates a listener port port on the local side.
Whenever a connection is made to this listener, the
connection is forwarded over the secure channel and a
connection is made to host:hostport from the remote
machine (this latter connection will not be secure, it
is a normal TCP connection). Port forwarding can also
be specified in the configuration file. ...port forward / port changing
I have my router set up to port forward various ports across, eg
ExtIP:25 -> Mail:25
ExtIP:80 -> Web:80
but I cant figure out how to make the ports different. Eg i have another
interal web server which i want to make available externally...
ExtIP:8000 -> OtherWeb:80
what is the exact command for this?
ip nat inside source static tcp 192.168.176.150 80 interface Dialer1 8000
but I dont seem to be getting anywhere.
It's an 827 running IOS 12.3(15).
Never mind, I have it working now. Mistyped the port in my external access
My ...port forwarding/ opening port
i'm having P4 2.4 256MB RAM with Win XP SP-2 Pro installed.
i'm using 256 kbps connection using adsl2+ router SmartAX MT882 ADSL
Router from Huawei, china
its having NAT & built in firewall.,,, i'm also using Win XP Firewall
to protect my pc..
i want to know how to use port forwarding & how to open port on router
so that i can establish connection, also i didn't understand the UDP &
TCP, what is it all about?
i want to open port for radmin connection...
also, how to know that how much secure my pc is from internet... any
i have referred to router ...What is the difference between local port forwarding (-L) and remote port forwarding (-R)
I need to do an SSH tunnel to encrypt the data sent between an agent
and a the server. I'm able to establish a tunnel but there's something
that I can't understand...
What is the difference between the bit -L and the bit -R. I've read
the man of SSH on Fedora. It's seems to be simple but in practice, I
Can somebody help me on this subject?
Thanks a lot!
> What is the difference between the bit -L and the bit -R.
-L forwards a port from the client to the server.
-R forwards a port from the server to the client.
To reply by email, replace "deadspam.com" by "alumni.utexas.net"
In article <email@example.com>,
Yann Laviolette <firstname.lastname@example.org> wrote:
>What is the difference between the bit -L and the bit -R. I've read
>the man of SSH on Fedora. It's seems to be simple but in practice, I
Example: "ssh -L 2000:22.214.171.124:2000 server" is a "local" forward and will
listen on the client (ie the machine you ssh'ed from) on port 2000.
If something connects to the client on port 2000, a "channel" will be
opened inside the SSH connection and the server will connect to 126.96.36.199 on
port 2000. Any data sent or received will be forwarded over this channel.
In contrast, "ssh -R 2000:188.8.131.52:2000 server" is a "remote" forward,
which will cause the *server* to listen o...Port Forwarding and Multiple SSH Servers
Behind my firewall I have several SSH servers that I connect to with
ssh -p xx user@firewall_IP_address
and then the firewall forwards it to the correct server, generally
running some version of Linux. The problem is this error message:
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this
Offending key in /home/user/.ssh/known_hosts:19
Password authentication is disabled to avoid man-in-the-middle
Keyboard-interactive authentication is disabled to avoid
X11 forwarding is disabled to avoid man-in-the-middle attacks.
Permission denied (publickey,password,keyboard-interactive).
On the client system $HOME/.ssh/config I've put :
but I still get the error message. My workaound is to remove the key
in known_hosts and then connect but I need to find a better solution.
Is there one?
The client is cygwin running on WinXP.
Thanks...Port forwarding ranges of ports in IOS
Is this possible? For instance, I want to port forward inbound a VoIP
providers UDP ports (e.g. 16000 16500). I cannot find anything about
how to do this so I'm thinking it's not possible.
On Aug 25, 7:23 am, locken...@gmail.com wrote:
> Is this possible? For instance, I want to port forward inbound a VoIP
> providers UDP ports (e.g. 16000 16500). I cannot find anything about
> how to do this so I'm thinking it's not possible.
you can use the 'range' parameter in the access list's command, i.e.:
access-list 100 permit ud...difference between port redirect and port forwarding
can any body point out the difference between in port redirect and port
forwarding? Actually i am trying to forward/redirect all the requests to
port 26 to 25, as i cannt access port 25 from my current network. I would
appreciate if somebody could suggest a solution for this problem.
On Thu, 30 Oct 2003 18:38:43 GMT, Anil Kommareddy
>Actually i am trying to forward/redirect all the requests to
>port 26 to 25, as i cannt access port 25 from my current network.
Trying to set up an open relay for SMTP? Having trou...how do i forward ports and allow access on some port?
I am using Norton System Works 2005 full edition (with nortn firewall)
on a windows 2000 professional OS , now i want to forward port
80,99,100 to a linux box running in the same office and I also want to
allow someone access on port 101 and 102.
Can someone help me out , how to do it.
> Hi all,
> I am using Norton System Works 2005 full edition (with nortn firewall)
> on a windows 2000 professional OS , now i want to forward port
> 80,99,100 to a linux box running in the same office and I also want to
> a...netscreen: not allowed to port forward port outside port < 1024 to one inside >= 1024?
I'm using a netscreen-25 and it seems to be the case that when I try to
set up a port forward from virtual port 80 (outside) to port 8080
(inside) it won't let me:
"port number should be between 1024 and 32767, or default 1024"
.... and then it sets my port 80 to be 1024. Virtuals ports < 1024 are
not allowed for some reason....
I am doing the port forwarding by using the VIP (virtual IP) feature btw.
Why should there be such a limiation?
Is there any compromise possible?
Alex Hunsley wrote:
> I'm using a netscreen-25 and it seems to be the case that w...ssh, port forwarding
Does anyone know why ssh connections use seemingly random port
numbers? At least it appears that way in a tcpdump output:
"192.168.1.201:61032 > 192.168.1.1.ssh", or "192.168.1.1.ssh >
192.168.1.201.56365" ...and others.
I'm trying to ssh in to .201 from the WAN. .1 is running a nat-
enabled firewall (FreeBSD 7.0, natd, ipfw) and is configured to
forward port 2222 to 192.168.1.201:22. But I cannot connect, and I've
narrowed the problem down to my firewall, which only has 22, 67, 80,
and 2222 open for incoming connections. Is there a specific range I
should open up, e.g. 45000-65535 ?
I would appreciate any insight...
Steven Borrelli <email@example.com> wrote:
> Does anyone know why ssh connections use seemingly random port
> numbers? At least it appears that way in a tcpdump output:
> "192.168.1.201:61032 > 192.168.1.1.ssh", or "192.168.1.1.ssh >
> 192.168.1.201.56365" ...and others.
TCP connections have two port numbers. The one on the client end, and
the one on the server end.
It's common to not specify a port for the client and have the OS pick
one for the connection, and specify only the one on the server. That's
what SSH is goind. This tells us that the 1.1.ssh side is the server
side, and the 1.201.xxx side is the client.
> I'm trying to ssh in to .201 from the WAN. .1 is running a nat-
> enabled firewall (FreeBSD 7.0, natd, ipfw) an...SSH and forwarding port
I want to use SSH from my work desk to the client site for doing some
diagnosis on electronic systems. The network will be like that:
One PC at work desk with ssh client on private LAN. SSH client is configured
for forwarding port 9000 for example (in fact, my diagnosis application). A
firewall accept the outgoing connection by port 22.
At the client site, one PC with SSH server. The connection to Internet will
be by DSL link and some servers (diagnosis servers) will be connected on
the Ethernet private network on site (by Ethernet connection on the SSH
My question is this one:
The final destination of the forwarding TCP frame is a diagnosis servers on
client private LAN (for example address 10.0.1.1 on port 9000) through the
PC with SSH server. When SSH server has decrypted the frame, what to do
with this frame? Because I want that this frame arrive to the diagnosis
servers. I don't know what to do exactly!.. Is the frame will be routed on
the LAN by SSH server PC?
Thank you for your help.
-----BEGIN PGP SIGNED MESSAGE-----
Bruno Caruso wrote:
| I want to use SSH from my work desk to the client site for doing some
| diagnosis on electronic systems. The network will be like that:
| One PC at work desk with ssh client on private LAN. SSH client is configured
| for forwarding port 9000 for example (in fact, my diagnosis application). A
| firewall accept the outgoing connection by port 22.
| At the client site, one PC with ...ssh port forwarding
Please, explain me where I'm wrong.
I have two machines with linux and FreeBSD and I desire to have a
secure tunel for HTTP between them. So I make it in the following way:
linux@lunc:~$ ssh -2 -L 1234:localhost:6661 lunc@freebsd
and afer that I tried to make following HTTP request
"http://localhost:1234/" on my linux box by Firefox browser. However, I
saw by tcpdump that http wasn't tuneled:
linux@root# tcpdump -X -s 128 -v port 6661
19:47:07.980462 IP (tos 0x0, ttl 64, id 62776, offset 0, flags [DF],
proto: TCP (6), le...ssh port forwarding
I am trying to get access to a friends' computer via ssh. Unfortunately, his
computer is behind a router which doesn't support NAT (Network Adress
Translation). Consequently, I cannot connect directly on his computer using
a command like "ssh user@ip_adress" because his router is blocking me.
Then, I got the idea that perhaps if my friend would start a ssh connection
from HIS computer to MINE, and then somehow by tunneling I would be able to
get access to his computer. But after having read the manpages of ssh and
something on the internet, I must state that I do n...Forward only some ports through ssh
Is it possible to forward only some ports (cvs and mysql for example)
through ssh using the authorized_keys.
...SSH Port forwarding
I am running an application over telnet interface on port say 5566
So I generally connect telnet <hostname> 5566.
How to connect to the application via ssh (using ssh portforwarding.)
Thanks and Regards,
> Hi All,
> I am running an application over telnet interface on port say 5566
> So I generally connect telnet <hostname> 5566.
> How to connect to the application via ssh (using ssh portforwarding.)
> Thanks and Regards,
ssh -L 5566:localhost:5566 userid@remotehost
telnet localhost 5566
Thanks. It works.
But what happens is it directly logged into the remotehost which I
don't want. I want the user to get only the info through the port 5566
Thanks in advance,
> Jc wrote:
> > Hi All,
> > I am running an application over telnet interface on port say 5566
> > So I generally connect telnet <hostname> 5566.
> > How to connect to the application via ssh (using ssh portforwarding.)
> > Thanks and Regards,
> > Jc
> ssh -L 5566:localhost:5566 userid@remotehost
> telnet localhost 5566
On 9 Jan 2007 23:38:46 -0800
"Jc" <firstname.lastname@example.org> wrote:
> Thanks. It works.
> But what happens is it directly logged into the remotehost which I
> don't want. I want the user to get only the info through the port 5566
Having got SSH working on my Solaris 2.8 Ultra (Thanks list) I now have
a question regarding making the port a bit more secure. Almost as soon
as 22 was opened on the firewall I saw an attempt to get in from North
What I have done so far is to:
Move the port from 22 to above 1024.
Turn off allowing root.
Turn off password checking so you have to have a known rsa key.
Is this enough or can I improve on this?
NB Remove no-spam- for good email address
"Dave Saville" <email@example.com> writes:
>Having got SSH working on my...