solving arp problem by using iptables

["Le Van Thanh" <thanhle@xxxxxxxxxxxxxx>]

In the article "ARP problem with LVS/DR and LVS/TUN", the writer tell me a way 
to solve the arp problem by using iptables by using the following command:

iptables -t nat -A PREROUTING -p tcp -d <VIP> --dport <vport> -j REDIRECT 
--to-port <vport>

Can anyone please tell me what this command does and how I use it?

I tried to setup an alias interface in a real computer( running http service) 
with vip=10.70.75.4

and then I typed the command

iptables -t nat -A PREROUTING -p tcp -d 10.70.75.4 --dport 80 -j REDIRECT 
--to-port 80

But it failed ( I could browse the web pages through this alias interface).


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Le Van Thanh
Hardware and Network Solutions Department.
Netsoft Co.
142 Nguyen Dinh Chieu, Dist.3, HCM City, VietNam.
Tel: 9141130 ext 17
Email: thanhle@xxxxxxxxxxxxxx,
       thanhlv@xxxxxxxxxxx  

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