two_serial_card_numbers
 

Hi, I don't uanderstand some thinghs about my connection: I connect my computer with a dhcp protocol and I have a ethernet card with its serial number and its ip. In add I have a dhcpsid with an ip adress and a dhcpsiaddr with a different serial number. I should have just one card and one ip to connect on internet!?! no?! What does it mean? give me a slack!

bye bye

can you explain what you mean by a "serial number" here? where are you seeing these different numbers? what are they?

I assumed he meant MAC address, but to be honest, I can't make heads or tails out of the whole post.

Sorry, my English is unclean, I try to explain my problem better:

I have installed a Linux Slackware 11.0 and this is my dhcpcd-eth0.info file in /etc/dhcpc directory:

IPADDR=xx.xx.xx.22
NETMASK=255.255.248.0
NETWORK=xx.xx.xx.x
BROADCAST=xx.xx.xx.255
GATEWAY=xx.xx.xx.x
DOMAIN='fastwebnet.it'
DNS=xx.xx.xx.xx; xx.xx.xx.xx
DHCPSID=xx.xx.xx.20
DHCPGIADDR=0.0.0.0
DHCPSIADDR=0.0.0.0
DHCPCHADDR=xx:xx:xx:xx:xx:33
DHCPSHADDR=xx:xx:xx:xx:xx:D8
DHCPSNAME=''
LEASETIME=3600
RENEWALTIME=1800
REBINDTIME=3150
INTERFACE='eth0'
CLASSID='Linux 2.4.33.3 i686'
CLIENTID=xx.xx.xx.xx.xx.33

This is my rc.inet.conf file in /etc/rc.d directory:

# Config information for eth0:
IPADDR[0]=""
NETMASK[0]=""
USE_DHCP[0]="yes"
DHCP_HOSTNAME[0]=""
# Default gateway IP address:
GATEWAY=""

I have a dhcp connection with FastWeb, an Italian provider, who has also installed a Home Access Gateway Adsl whit three ethernet port in my home ( I have plugged in just one ethernet card because I use just one computer ). When I connect my computer on internet I get every time a different IP. It can be xx.xx.xx.21/22/23 ( note: my DHCPSID=xx.xx.xx.20 never changes and it is the same of my ip address, only last number changes ). Moreover, my DHCPCHADDR=xx:xx:xx:xx:xx:33 is not the same of my DHCPSHADDR=xx:xx:xx:xx:xx:D8 but it is the same of my CLIENTID=xx.xx.xx.xx.xx.33; what does it mean? I suppose that one is computer's mac adress and the other one is home access gateway's mac adress. I have many doubts: If I have a dhcp connection usually I get a different ip adress (dynamic IP), but why my Home Access Gateway Adsl has a static ip? it would changes every time that I make a connection! no? Moreover: I don't understand what is "NETWORK" ( see thirdy line of my dhcpcd-eth0.info) and what is a "GATEWAY" ( see the five line of my dhcpcd-eth0.info ), logically it would be the same of my DHCPSID=xx.xx.xx.20! no? In general I'm trying to understand how my internet connection works and which kind of service the provider gives me. I go on internet, sure! but my provider put me behind ( or inside ) a NAT and this is serious problem. When I have Installed Guarddog software ( do you know it? yes you well know it! ) to set up my firewall. After Guarddog's HOW-TO guess me to test it onto a specific server (now I really don t remember which one ). The server send me a false ip adress whit a message: "if your ip adress showed is false don't keep up this test; probably you are behind a NAT". I have realized that my computer is behind a NAT made by my provider, I have gotten many evidence about that. Now, NAT makes my connections slower and I can't use bittorrent as well as it can ( even ftp doesn't run fast and I can't access to many usefull services like freechess.org or e-mail server). I know that NAT means Network Adress Translation and it translate the trues ip address in false ip adresses ( why that? ).
Now! I want understand which kind of specific connection my provider gives me in order to make a good, secure, fast and stable connection. Obviously I want disable NAT. Could you give me a slack? may be I'am posting a question not allowed here: I read on linuxquestion.org that is forbidden posting about how to hack software or network system. Sorry me if I have broken in some way linuxquestion.org's rules. I hope to have been clear this time. Thank you very much for your patient.

Bye Bye.