I performed a tcpdump on my internal firewall, Fortigate 311B, (the SX20 is on another network, routed through the Internet) and did not detect any record of SYN ACK on the firewall, towards the VCS-E for the SX20.
Then this same check performed on another endpoint, also an SX-20 in another network under the same conditions.
I've found that the same problem occurs TCP checksum error, but the same internal firewall SYN ACK packet is forwarded in the sense VCS-E for the SX20.This equipment is typically logs in VCS-E (SIP port: 5061 transport: TLS).
I performed another check in VCS-E in relation to its NIC, referring the "checksum offloading" was enabled:
I accessed the VCS-E via an SSH connection, and gave the following command:
ethtool - show-offload eth0
In response I got:
Offload parameters for eth0:
For the answer above is not the problem this variable, I have no idea what could cause this error, since I have another VCS-E and performed the same tests and got the same results.
IntroductionFeatured ExpertQ:Under what circumstances does it make sense to view "resource total" as opposed to "resource available" or vice versa?Q:Can that be sent to a Syslog server?Q:Is it possible to see when a device has changed, for example, if a ...
(view in My Videos)
Community Live- Tour of the Real-Time Monitoring Tool
(Live event - Tuesday, 20 April, 2021 at 10:00 am Pacific/ 1:00 pm Eastern / 7:00 pm Paris)
This event had place on Tuesday 20th, April 2021 at 10:00 hrs PDT
What is th...
Hello Admin Community!
I’m recruiting participants for an upcoming study looking at large meeting troubleshooting in Control Hub. If you’d like to participate, please fill out this quick, 2 min. survey. Thanks! https://www.surveymonkey.com/r/...
Don't you just hate having to run RTMT in a virtual machine, well here it runs in an app for mac. I have complied a version for CUCM 14.x ( from a version I got for 11.x ) It works on older versions also. Here it is https://haffi.is/rt...
To participate in this event, please use the button to ask your questions
Tour of the Real-Time Monitoring Tool
Have any questions about the Real-Time Monitoring Tool?
What is the Real-Time Monitoring Tool (RTMT) and how do I use it? In addition to...