Be Careful with TCP Syslog and the ASA

I wanted to take just a moment to share a little gotcha that could take you by surprise. To demonstrate, I have a simple topology with an ASA in the middle. I am inspecting ICMP so ping traffic is stateful and flows properly.

TCP Syslog
To confirm connectivity,  I can ping from csr1000v-2 from csr1000v-1

csr1000v-1#ping 10.0.0.10 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 2/6/16 ms

Now for the ASA change that can catch an administrator off guard

asav-1(config)#logging on
asav-1(config)#logging trap informational
asav-1(config)#logging host inside 1.1.1.1 tcp/1025

//clear the connection just to make sure the next connection will be new
asav-1(config)#clear conn

Now the connectivity from csr1000v-1 to csr1000v-2 is broken

csr1000v-1#ping 10.0.0.10 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.10, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

So what is wrong? Let’s take one quick look at the logging configuration.

asav-1(config)# show run logging
logging enable
logging trap informational
logging host inside 1.1.1.1 6/1025
asav-1(config)#

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