ifconfig shortcomings

costasm · 10-23-2003, 10:24 PM

I searched and could not find an answer for this.

"ifconfig" on Linux does not show the following information:

-DNS servers
-Default Gateway/DHCP servers

However "ipconfig /all" in Windows shows all that.

Is there an option or command to find the missing info?

Thanks

beolach · 10-23-2003, 11:16 PM

You can find the default Gateway with

/sbin/route

or

/sbin/route -n

It will output your routing table, including your default gateway, as below:

Code:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
Default         <hostname>      0.0.0.0         UG    0      0      0   eth1

or (/sbin/route -n)

Code:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         <hostip>        0.0.0.0         UG    0      0      0   eth1

The DNS servers are listed in the /etc/resolv.conf file. Find what they are by running:

cat /etc/resolv.conf

Code:

nameserver <nameserver1-IP>
nameserver <nameserver2-IP>
search <domain-suffix>

How to find the DHCP server you got your IP from depends on what DHCP client you are using, and how it is set up to store info. On my box, I use dhcpcd which saves info in /etc/dhcpc/dhcpcd-ethN.info. In that file it has a line like:

DHCPSID=<DHCP-server-IP>

Much more info available:
man 8 ifconfig
man 8 route
man 5 resolv.conf
The DHCP-mini-HOWTO

Hope this helps,
Beolach

costasm · 10-24-2003, 08:02 AM

Thanks. It would have been nice if it was all in one place I guess.