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linux-system-roles / firewall

Configure firewalld and system-config-firewall
https://linux-system-roles.github.io/firewall/
GNU General Public License v2.0
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How to debug or fix the issue in firewall blocking an IP #92

Closed shruthidharani-4313 closed 1 year ago

shruthidharani-4313 commented 2 years ago

I am trying to place a snmp request from a server and I receive a snmp response from a client IP say "a.b.c.d". But my firewall is blocking that response from a.b.c.d IP it seems. snmp service uses the udp port 161 which I added already to allow this port in firewall rules.

What is happening:

When I place snmp request from a server to test.com, I am getting => Timeout: No Response from test.com When I take tcpdump logs in server, I could see the response coming in to the server from test.com

But when I stop the firewall service, I can see the snmp response. When firewall is running, I get "Timeout No response".

What could be the issue in my firewall and how can I find/solve this? It would be really helpful if someone helps me with this. Thanks in advance!

erig0 commented 2 years ago

Can you describe your topology a bit better? I ca not decipher which nodes are running firewalld nor how many there are.