Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

ip sla type jitter through firewall/NAT


I have a ip sla operation on a 1841 behind a NAT-Firewall (Sonicwall):

ip sla monitor 1

type jitter dest-ipaddr A.X.Y.Z dest-port 5060 codec g711ulaw

tag "test-voip-jitter"

ip sla monitor schedule 1 life forever start-time now

The router has an internal IP ( which is one-to-one natted to an external IP.

On the sending router I see the following:

wn-sada-walli#sh ip sla monitor statistics 2

Round trip time (RTT) Index 2

Latest RTT: NoConnection/Busy/Timeout

Latest operation start time: 05:58:57.221 MET Tue Oct 30 2007

Latest operation return code: Timeout

RTT Values

Number Of RTT: 0

RTT Min/Avg/Max: 0/0/0 ms

On the ip sla responder I see that the host tried to connect to it and the responder does not see any errors:

IP SLA Monitor Responder is: Enabled

Number of control message received: 282106 Number of errors: 0

I have searched the docs regarding ip sla behind nat but have not found anything.

Can anyone help me getting this to work?

Thank you and kind regards

Flavio Curti

CreatePlease to create content