[CentOS] ipforwarding between interfaces and firewall rules

Sat May 1 04:19:00 UTC 2021
Anthony K <akcentos at anroet.com>

On 1/5/21 2:15 pm, Anthony K wrote:
> 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
That didn't format well at all - one more try:

On firewall: tcpdump -l -n -i any port 53 or port 5353 ---

On client: query www.google.com