If you run tcpdump against the interface on the CentOS box that you are expecting to respond to these attempts and you see no traffic then the problem is further up the network chain. Tcpdump will show the packets if they arrive on the interface at all - even if they are blocked by the firewall on CentOS - i.e. it "sees" all packets that arrive on that interface before they are processed by anything so even if they are blocked then tcpdump will see them.
If the packets do not show up then the network switch that it is connected to is not sending them down the piece of wire connecting you to it.
If the packets do not show up then the network switch that it is connected to is not sending them down the piece of wire connecting you to it.
Statistics: Posted by TrevorH — 2023/08/22 08:58:21
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