some networking questions

[Nabin Limbu]

Hi,

Some networking questions. Hoping for your help.

Question 1:
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In /etc/sysconfig/network, I have an entry of FORWARD_IPV4="yes". But, whenever I 
restart network service (service network restart), ip forwarding gets turned off i.e. 
/proc/sys/net/ipv4/ip_forward resets to "0" from "1". What should I do to turn ip 
forwarding to remain ON after restarting network service also?


Question 2:
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Using ifconfig command, I get list of interfaces with other related information like traffic 
information (RX, TX packets). But, in one of my server I don't get traffic information of 
eth0:0 but I get for eth0 interface. But, in other servers I get traffic information for both 
eth0 and eth0:0. Is there any way to know how it happened?

Question 3:
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In my lan, somebody used ip address of proxy server in his computer, which resulted 
problem in whole network since the traffic to proxy server was redirected to his 
computer. Is there any way to stop / diminish the effect of such incident?

With Regards
Nabin Limbu