Redhat 6.1 Gateway

I have setup RH Linux 6.1 with DNS setup and connected to our ISP. Now I would like all our users who connected to Internet to go through the DNS server. How can I do that? And how can I know it is going through the DNS. Do I need two network cards for this? I am using Windows 98 "telnet" and using Windows NT 4 DHCP server to obtain individual's IP address.

If my IP address is 172.xx.xx.xx and my nameserver is, when I telnet or ftp to other sites, how can I have listed as where I telneting from rather than the IP address?
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j2Connect With a Mentor Commented:
You need to set up the "reverse domain"

(ip revese mappings in linuxconf) this also requires that your ISP _supports_ end users managing their revese zones.

You dont "Need" two net cards, but it simplifies the operation. You arent mentioning if you are using masquerading or not which is also a factor.
Fixed the -1 problem on this question.
Escrow points corrected.

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