internal modem loopback address

sumathi · 07-27-2005, 07:06 AM

Hi,
I am using the Dlink internal 56Kbps Data/Fax/Voice Modem. In that i want to do some loopback ping test. I tried pinging with loopback IP address 127.0.0.1. But this is not the loopback address of modem card, because system can ping without modem card. So please help me in finding out the loopback address of modem card.

With Regards,
Sumathi

Half_Elf · 07-27-2005, 09:47 AM

I don't think there is a way to tell your modem to ping itself, as the kernel will always use the shortest path. So if you are connected to the internet using your modem with, as example, the ip 1.2.3.4, pinging 1.2.3.4 will always answer and really fast, as the kernel doesn't send the data to your ISP (which would be a dumb behavior anyways).

Why do you want to do this? Usually, ping results on some large servers (say, google.com?) are pretty accurate.

sumathi · 07-28-2005, 01:13 AM

Hi,
Then what is this loopback address 127.0.0.1

Half_Elf · 07-28-2005, 06:50 AM

Quote:

Then what is this loopback address 127.0.0.1

This is THE loopback interface? This is somekind of "virtual" network card pointing to yourself. It has nothing to do with your network card or your modem, every Linux computer have this, no matter the hardware or if it is a modem or a network card physically in the box.

Again, if you could explain why you want to do this I could maybe think of something, but right now what you are asking is a bit confusing