Is it going to work?

  • Thread starter Thread starter Wi
  • Start date Start date
W

Wi

Hello Everyone
I've installed a second network card and changed its MAC address to have the
same value as the first, authorized by ISP, card. The first card
automaticaly recognizes IP (and recognizes my internal IP), on the second
card IP settings are set manually (external IP). Both cards I've connected
to a hub with LAN out.
I need internal IP to connect to my LAN DC hub (works ok) and,
simultanously, I want to (using another DC client) connect to other hubs
using my external IP.
There comes a clue of my post:
simultanously, it doesn't work, doesn't connect to hubs.
Have I done sth wrong, or this is just the way network goes, and nobody can
do anything about this...?

Thanx in advance
Geezer
Wi[PL]
 
I got a little lost at the end there, but regardless, are you saying BOTH
NICs now have the SAME MAC address?! Sorry, if so, that's ain't gonna work.
The TCP/IP addresses used in the OS and apps is merely an abstraction, to
make management of networking easier. Ultimately, all IP addresses are
resolved to a physical MAC address on the card, it's this MAC address that
distingusihes one NIC from another at the Ethernet level. So if two cards
are reporting the same MAC address (something that should NEVER happen), you
have a problem. Either neither will work, or one will and the other won't.

Or else I'm missing your point.

HTH

Jim
 
I've heard of MAC changing from my friend (Ph.D. of IT), who wanted to
connect to the internet from his laptop. He just added a second NIC in his
stationary puter, changed its MAC and connected to the laptop. According to
him, it works. That's why I made up my mind and started to think... :)
I just thought if my internal IP is resolved to my authorized by ISP NIC's
MAC and my external IP is resolved to this MAC as well, so there could be a
chance that a addictional NIC (with changed MAC) might work using ext IP.
This configuration works. You can connect to my ftp server either using ext
IP or int IP (my LAN users of course). Both NICs report no conflicts,
transmit and receive some datas. I know that two NICs shouldn't have the
same physical addresses (that's MAC is for), but I'm just experimenting and
hoping to solve this problem, unless it is unsolvable :-) The problem is
with connecting to DC hubs using ext IP settings. If you found this
experiment interesting you'd follow up by yourselves.

Wi
 
Wi said:
I've heard of MAC changing from my friend (Ph.D. of IT), who wanted to
connect to the internet from his laptop. He just added a second NIC in his
stationary puter, changed its MAC and connected to the laptop. According to
him, it works. That's why I made up my mind and started to think... :)
I just thought if my internal IP is resolved to my authorized by ISP NIC's
MAC and my external IP is resolved to this MAC as well, so there could be a
chance that a addictional NIC (with changed MAC) might work using ext IP.
This configuration works. You can connect to my ftp server either using ext
IP or int IP (my LAN users of course). Both NICs report no conflicts,
transmit and receive some datas. I know that two NICs shouldn't have the
same physical addresses (that's MAC is for), but I'm just experimenting and
hoping to solve this problem, unless it is unsolvable :-) The problem is
with connecting to DC hubs using ext IP settings. If you found this
experiment interesting you'd follow up by yourselves.

Wi
Click to expand...

Hello

I don't think you can change the MAC addresses of NIC's. They are hard coded
in the chips at hardware level.
You might have been fooled by doing this at software level.
But the Address Resolution Protocol(ARP) will always resolve the addresses
using the addresses hardcoded in the NIC.

Anyway How did you change the MAC addresses?

Madhur
India
 
I don't think you can change the MAC addresses of NIC's. They are hard
coded
in the chips at hardware level.
You might have been fooled by doing this at software level.
Click to expand...

You might be right. I've filled in the "Network address" in NIC's advanced
properties field (WinXPprof). The real change is hard to make, unless
software cheating ;-)
As I said before, according to connecting to my ftp server using both IPs,
this configuration works. This made me to ask you how to solve the problem
with DC.

Regards
Wi
Poland
 
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