Does this iptables output mean all traffic is allowed?

GregH asked:

I am having problems running a program from a client to my RHEL box that uses a non-standard port and I am trying to track down where the communication problem is occurring. I’m starting at the server to make sure traffic is being allowed. Unfortunately I’m no expert at interpreting iptables output. Here is the command I issued and the output. Does this mean that ALL traffic on ALL ports is allowed since the policy is “ACCEPT”?

# iptables --line-numbers -n -L -v
Chain INPUT (policy ACCEPT 5359 packets, 788K bytes)
num   pkts bytes target     prot opt in     out     source               destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num   pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 5073 packets, 764K bytes)
num   pkts bytes target     prot opt in     out     source               destination

My answer:


The firewall you show is completely off, and all traffic is being allowed.


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