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Using tcpdump for SIP diagnostics

TCPdump is a powerful command-line packet analyzer, which may be used for a SIP message sniffing/analyzing. TCPdump is preinstalled on many linux distributions, or may be installed directly from debian repository:

apt-get install tcpdump

TCPdump allows write sniff to a file or display it realtime. Its usage for SIP message analysis may look like:

Juniper vSRX as a router

The Juniper vSRX firewall can be operated and configured as a router. The reasons may be various, the use in GNS3 may include that vSRX has a smaller memory footprint or non-separated data and control plane. So. to do this, you must :

set system host-name ABC
set system root-authentication plain-text-password PASSWORD

And then change the packet processing mode from flow-based to packet-based: