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iptables & port 53 (DNS)

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Operating Systems Linux Red Hat iptables & port 53 (DNS)
# 8  
Old 04-18-2012
Hi,

Code:
# iptables -L -v -n
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
 2005  148K RH-Firewall-1-INPUT  all  --  *      *       0.0.0.0/0            0.0.0.0/0           
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 RH-Firewall-1-INPUT  all  --  *      *       0.0.0.0/0            0.0.0.0/0           
Chain OUTPUT (policy ACCEPT 1980 packets, 189K bytes)
 pkts bytes target     prot opt in     out     source               destination         
Chain RH-Firewall-1-INPUT (2 references)
 pkts bytes target     prot opt in     out     source               destination         
 1381 79928 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           
    0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           icmp type 255 
    0     0 ACCEPT     esp  --  *      *       0.0.0.0/0            0.0.0.0/0           
    0     0 ACCEPT     ah   --  *      *       0.0.0.0/0            0.0.0.0/0           
    0     0 ACCEPT     udp  --  *      *       0.0.0.0/0            224.0.0.251         udp dpt:5353 
    0     0 ACCEPT     udp  --  *      *       0.0.0.0/0            0.0.0.0/0           udp dpt:631 
    0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:631 
  621 67768 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
    1    40 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22 
    2   108 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited 
    0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:53 
    0     0 ACCEPT     udp  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW udp dpt:53

R,
D.
# 9  
Old 04-18-2012
I don't see it being restricted here. Are you sure you've working nameservers in /etc/resolv.conf ?
# 10  
Old 04-19-2012
This is an external virtual machine so I have no control over the network.

However I think it may have got to do with a restriction between the host that the VM sits on and the DNS server. Waiting on confirmation from the external hosting people to fond out if they can connect to the named server over port 53 from the server that is hosting the VM.
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