I followed the tutorial in this link and got one site up(domain1.com). Now, I have two ips. However, the second site has no response. What's wrong with my settings? Are there other things I need to check? Thank you.

My vhost file: /etc/httpd/conf.d/vhost.conf

NameVirtualHost 173.230.154.x1:80
NameVirtualHost 173.230.156.x2:80

<VirtualHost 173.230.154.x1:80>
ServerAdmin xxx@gmail.com
ServerName domain1.com
ServerAlias www.domain1.com
DocumentRoot /srv/www/domain1.com/public_html/
ErrorLog /srv/www/domain1.com/logs/error.log
CustomLog /srv/www/domain1.com/logs/access.log combined
</VirtualHost>

<VirtualHost 173.230.156.x2:80>
ServerAdmin xxx@gmail.com
ServerName domain2.com
ServerAlias www.domain2.com
DocumentRoot /srv/www/domain2.com/public_html/
ErrorLog /srv/www/domain2.com/logs/error.log
CustomLog /srv/www/domain2.com/logs/access.log combined
</VirtualHost>

Have you told apache to listen on that IP?

i.e.

Listen 173.230.156.x2:80

Can you ping the ip?

Oh, I didn't add new IP to httpd.conf and I couldn't ping it too. Guess this is the problem. Anyway, I will use name-based site first.

Thank you.

If you cant ping it then you either haven't added it to your network configuration properly or your firewall is blocking it.

See

http://library.linode.com/networking/co ... nterfaces/

oops, I didn't do this too. I thought the system automatically have this setup for me.

There's a warning on your linode's network page "DHCP will only assign the primary IP address. For multiple IP addresses, you should use a static configuration."