[ILUG-BOM] bash proxy settings

Debarshi 'Rishi' Ray debarshi.ray@[EMAIL-PROTECTED]
Fri Mar 30 13:50:15 IST 2007

Firstly, may I know what is your ultimate aim? :-)

>> I tried the above but now when i try to ping www.google.com
>> ping: unknown host www.google.com  is what i get.

Make sure there is a DNS server that is reachable from your machine.
The best way would be to run BIND as a caching DNS server ('# service
bind start' for Red Hat systems) on the machine running the proxy
server, and configure your machine to use this as the primary DNS (use

To confirm that this actually works do:
$ nslookup gnu.org
on your own machine.

[ If you can not have a DNS then try:
$ ping
If this fails, then read on.]

Next, make sure you have a gateway that actually forwards the packet
from your subnet to the outside world. I have had experience using a
'gateway' which never forwarded anything, so make sure that the
sysadmin is not lying and the gateway is actually forwarding the

Checking this is a bit dicey, and depends if there is any firewall
that is blocking traffic bound to specific ports and so on. Here are a
few things you can try:
1. $ ping google.com
2. Try using an email client like Mutt, Thunderbird, KMail and see if
you can send and receive mail or not. If the SMTP and/or POP3 traffic
is blocked this would not work.
3. Disable the proxy in the Web browser (eg., Firefox), and try to
visit any site. Again if port 80 or 443 traffic is being blocked or
not forwarded, this would not work.
4. Try using Gaim. Do not set any proxy, and try to log into Yahoo!,
Jabber, or IRC.
5. Try SSH, without using any HTTP proxy tunnelling tool (like
Corkscrew). If you have not heard about tunnelling, then most likely
you do not have a any such tool. Just do something like:
$ ssh foo at external.server

Knowing your ultimate aim would have been helpful.

GPG key ID: 63D4A5A7
Key server: pgp.mit.edu

More information about the Linuxers mailing list