Can you ping from other machines in the same subnet? Do you have iptables running on the machine and is icmp allowed? Post the output of `iptables-save` if you cannot solve this yourself. [by TrevorH]
on 11/05/2012 – Made popular on 11/05/2012
Protection of WEB and DNS servers using the context-free rules for packet filtering:
- Protect your WEB-server, so that would be for him can be accessed by browsers, and could go to dns.
- Protect your primary DNS-server so that it could be to contact clients and secondary servers.
- Allow ICMP ping to / from your site (s).
- the rest is declined.