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I'm having a Strange issue with CentOS 7. I have my server setup with 2 NICs a private network and a public network. I'm able to ping the server on both the private and public IP. But I cannot ping FROM the server any public IP. What's strange is that I could access the public network from the server (curl public sites, download files, etc..) but I cannot ping out. However, I could ping other servers on the same private network.

I have tried to stop firewalld but that wasn't the issue. I have other servers with similar config running CentOS 6 and I've never encountered this problem.

So this works:
-From a remote machine:
ping my server ip
ping my server internal ip
-From the server
ping another server internal ip

Doesn't work:
-From the server
ping any public ip
ping server public ip gateway

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1 Answer 1

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It ended up being a routing problem.. All my traffic was being routed through the internal NIC so I couldn't ping any public IPs.

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