[CentOS] ipforwarding between interfaces and firewall rules

Sat May 1 04:15:04 UTC 2021
Anthony K <akcentos at anroet.com>

On 26/4/21 8:42 am, R C wrote:
> ...
> for example; if I do "ping www.google.com"  I get a "ping 
> www.google.com: Name or service not known"  If I use  an IP address 
> (from www.google.com), it just works.

Sometimes seeing the traffic flow reveals what's really going on. To 
that end, run command below on the firewall box: tcpdump -i any port 53 
or port 5353 Then on the client, query www.google.com