On 10/28/2015 09:24 AM, Rick Stevens wrote:
You have a DNS resolution issue.
It's probably an mDNS issue, and replies should normally be allowed by the default "accept RELATED,ESTABLISHED" rule.
It might be helpful to see the output of "iptables -L -n -v".
With the firewall enabled, as root, try: # iptables -L -n | grep :53 and make sure you see lines like: ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:53 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
You'll normally only see those lines when you're running virtualization, or a DNS server. They aren't necessary for mDNS, which uses a different port entirely.
I suspect that you see them because you're running libvirt. If you use "iptables -v", you would see that those rules only affect packets on the virbr0 interface. They're not related to your non-virtualized applications (or to mDNS in any case).
Also make sure avahi-daemon and dnsmasq are running.
If mDNS is working when the firewall is down, we can assume that avahi-daemon is running. dnsmasq is not required for mDNS.
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