firewall (iptables)

**opensuser** · 03-04-2008

Hi,
could you tell me how to disable/enable access to a site and the steps to discover the ip of a site!
Answer the quicker you can please!
opensuser

**Kieren** · 03-04-2008

Originally Posted by opensuser

Hi,
could you tell me how to disable/enable access to a site and the steps to discover the ip of a site!
Answer the quicker you can please!
opensuser

To discover the IP address for a website simply ping it. To get Google's IP address you can:

Code:

kieren:/home/kieren# ping www.google.com
PING www.l.google.com (74.125.19.103) 56(84) bytes of data.
64 bytes from cf-in-f103.google.com (74.125.19.103): icmp_seq=1 ttl=244 time=214 ms
64 bytes from cf-in-f103.google.com (74.125.19.103): icmp_seq=2 ttl=244 time=311 ms
64 bytes from cf-in-f103.google.com (74.125.19.103): icmp_seq=3 ttl=244 time=268 ms
64 bytes from cf-in-f103.google.com (74.125.19.103): icmp_seq=4 ttl=244 time=262 ms

--- www.l.google.com ping statistics ---
4 packets transmitted, 4 received, 0&#37; packet loss, time 3003ms
rtt min/avg/max/mdev = 214.905/264.344/311.633/34.291 ms

This shows that Google's IP address is 74.125.19.103. However - large sites such as Google have many different IP address' to deal with many users accessing the site at the same time so it isn't very realistic to block a site by it's IP address.

**praka123** · 03-06-2008

nslookup google.com will help

**Kieren** · 03-07-2008

This might not get ALL the Google IPs, but only the ones the most local DNS server knows about

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