Hi,

My PC is part of a LAN so while configuring eth0, we specify the Gateway to access all other resources in the network.
The PC successfully access Internet through a proxy server configured in Mozilla(manual proxy config) but the update option or the Synaptic Pkg mngr are not able to access internet anyway. I have tried the option "Apply System Wide" in "Network Proxy" but no progress so far.
I also tried to forward all request coming for udp/tcp on port 80 to the proxyserver on a specific port, but with no success.

Also I can't ping any website from terminal, reiterating the fact that I can access internet in firefox through the proxy on a specific port.

Any suggestions !!

As far I know, Synaptic is using a specific port.
Years ago I was in a similar situation, and I had to open some additional ports on the proxy (Squid-proxy - Not only for update-managers, for MSN, POP3/SMTP etc. too).

The only never worked with proxy was FTP-access, but this I did with a bypass.

thanX wapa17, but my problem resolved by using Network Manager. In my Linux Mint, I use network manager to configure the eth0, that is where We specify the IP Address, Subnet & Gateway & overlooked the DNS field.
Now-that I have specified the DNS address in the requisite field, system is able to do the DNS look up from all applications.