11-21-2006
port forwarding
Hi,
I have to install an application that has a built in tftp server. Tftp comes in on port 69. As i am not installing this application as a root user i am running into trouble because only the root user can listen to ports < 1024. So changing the port i listen to to one greater than 1023 isn't an option neither is installing the software as root user. Is there anything i can do in unix similar to iptables in linux that could forward anything that comes in on port 69 to a port greater than 1023 lets say 4000 then have my application listen to 4000 to recieve tftp traffic.
Cheers,
Joe.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I've been googling for a while now, trying to forward port 3000 to port 80....
In the past I used to DLink router to forward port 3000 to 80. I recently finished (well, is it ever done anyhow?) setting up my linux box and got it acting as a router.
I want to continue to run Apache on port 80... (1 Reply)
Discussion started by: meeps
1 Replies
2. AIX
Hi friends
i have the following setup
machine1 two network adapters one connected to lan the other connected directly to machine2
machine2 is not connected to lan
i need to access machine2 directly from the LAN
how to force machine1 to forward all traffic received on a specific port the... (1 Reply)
Discussion started by: Husam
1 Replies
3. UNIX for Advanced & Expert Users
Hi
I want to set up port forwarding from one network to another network. I already have this configured on the Linux box using iptables.
iptables -t nat -A PREROUTING -p tcp -i eth1 --dport 1521 -j DNAT --to 10.218.146.230
iptables -A FORWARD -p tcp -i eth1 -d 10.218.146.230 -j ACCEPT
... (2 Replies)
Discussion started by: slash_blog
2 Replies
4. Solaris
Hi,
I am looking out a way to forward all UDP traffic coming on ports 3001,3002,3003 and 3004 on server 10.2.45.200
to
corresponding ports of server 10.2.45.197.
I am using Solaris 10.0.
-bash-3.00$ uname -a
SunOS airtelussd2 5.10 Generic_127127-11 sun4u sparc SUNW,Sun-Fire-V445
Is... (6 Replies)
Discussion started by: vikas027
6 Replies
5. Solaris
Hi; I have the following issue:
I have a Solaris server running an old applications which connects to an http server in other server at certain port. The thing is that the http server has changed its ip and port and the addres in the app is hard coded and touching the app by now is out of the... (0 Replies)
Discussion started by: ppereira
0 Replies
6. IP Networking
Hi Linux/Unix Guru,
I am setting Linux Hopping Station to another different servers.
My current config to connect to another servers is using different port to connect.
e.g
ssh -D 1080 -p 22 username@server1.com
ssh -D 1081 -p 22 username@server2.com
Now what I would like to have... (3 Replies)
Discussion started by: regmaster
3 Replies
7. IP Networking
hi guys
i have a simple question !
i have two ips . a valid and internal(172.16.11.2)
i want to use port forwarding to forward any request to valid IP port 8001 to internal ip port 80 .
i use this rule :
sysctl -w net.ipv4.ip_forward=1
iptables -t nat -A PREROUTING -p tcp... (1 Reply)
Discussion started by: mhs
1 Replies
8. UNIX for Advanced & Expert Users
Hi experts,
We have windows machine ( A ) in one network & 2 Linux Servers ( B & C ) in another network. There is a firewall between these 2 networks and SSH (TCP/22) & HTTPS (TCP/443) are allowed from A to B only (but not to C). There is no personal firewall / iptables running on any machine.... (1 Reply)
Discussion started by: magnus29
1 Replies
9. IP Networking
Hello Gurus,
I have configured port forwarding at router.
But after configuration I am not able to connect the computer from outside/Over internet/Remote desktp from other computer.
Could you please advice?
Thanks-
Pokhraj (2 Replies)
Discussion started by: pokhraj_d
2 Replies
10. Red Hat
Hello All,
I would like to ask you very kindly with /etc/sysconfig/iptables file
I have to setup port forwarding on RHEL6 router. Users from public network must be able to ssh to servers in private network behind RHEL6 router. Problem is that servers in private network must be isolated.
My... (2 Replies)
Discussion started by: oidipus
2 Replies
TFTP(1) General Commands Manual TFTP(1)
NAME
tftp - trivial file transfer program
SYNOPSIS
tftp [ host ]
DESCRIPTION
Tftp is the user interface to the Internet TFTP (Trivial File Transfer Protocol), which allows users to transfer files to and from a remote
machine. The remote host may be specified on the command line, in which case tftp uses host as the default host for future transfers (see
the connect command below).
COMMANDS
Once tftp is running, it issues the prompt tftp> and recognizes the following commands:
connect host-name [ port ]
Set the host (and optionally port) for transfers. Note that the TFTP protocol, unlike the FTP protocol, does not maintain connec-
tions betweeen transfers; thus, the connect command does not actually create a connection, but merely remembers what host is to be
used for transfers. You do not have to use the connect command; the remote host can be specified as part of the get or put com-
mands.
mode transfer-mode
Set the mode for transfers; transfer-mode may be one of ascii or binary. The default is ascii.
put file
put localfile remotefile
put file1 file2 ... fileN remote-directory
Put a file or set of files to the specified remote file or directory. The destination can be in one of two forms: a filename on the
remote host, if the host has already been specified, or a string of the form host:filename to specify both a host and filename at
the same time. If the latter form is used, the hostname specified becomes the default for future transfers. If the remote-direc-
tory form is used, the remote host is assumed to be a UNIX machine.
get filename
get remotename localname
get file1 file2 ... fileN
Get a file or set of files from the specified sources. Source can be in one of two forms: a filename on the remote host, if the
host has already been specified, or a string of the form host:filename to specify both a host and filename at the same time. If the
latter form is used, the last hostname specified becomes the default for future transfers.
quit Exit tftp. An end of file also exits.
verbose
Toggle verbose mode.
trace Toggle packet tracing.
status Show current status.
rexmt retransmission-timeout
Set the per-packet retransmission timeout, in seconds.
timeout total-transmission-timeout
Set the total transmission timeout, in seconds.
ascii Shorthand for "mode ascii"
binary Shorthand for "mode binary"
? [ command-name ... ]
Print help information.
BUGS
Because there is no user-login or validation within the TFTP protocol, the remote site will probably have some sort of file-access restric-
tions in place. The exact methods are specific to each site and therefore difficult to document here.
4.3 Berkeley Distribution 1Q TFTP(1)