Hello,
I have a machine I am running Centos/RHEL 8 on. there are two interfaces
and I want to forward all traffic between those interfaces (for the src
and dst in the subnet a wireless device is on).
One interface is connected to a switch, WAN side. The other ethernet
port has an access point, connected wired.
I did turn on ipforwarding, and thought I needed only two firewall rules.
sysctl -w net.ipv4.ip_forward=1
firewall-cmd --direct --add-rule ipv4 filter FORWARD 0 -o eno1 -i
enp0s20u4u1 -j ACCEPT
firewall-cmd --direct --add-rule ipv4 filter FORWARD 0 -o enp0s20u4u1 -i
eno1 -j ACCEPT
However, when I try to do a DNS lookup, it looks like it is being
blocked/stopped by the firewall, because when I stop the firewall, it
just seems to work. With the firewall up and running, however I can ping
an ip address.
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.
what am I missing (probably a rule in the firewall?)
thanks,
Ron
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