Application Hosting Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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Application Hosting Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

Send and receive traffic through a Linux socket

Updated: June 12, 2026

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Send traffic from an external server to an open Linux socket on the router to verify that the Packet I/O infrastructure correctly delivers packets to hosted Linux applications.

Use this procedure to confirm end-to-end traffic delivery through the Packet I/O infrastructure after opening a Linux socket. Connect from an external server to the netcat socket that was started in the vrf-default network namespace, using an interface in the same VRF.

Before you begin

Before you begin, complete the steps in Open Linux sockets to start a listening socket on the router.

Procedure

From an external server, connect to the netcat socket on the router.

Example:

[root@localhost ~]#nc -vz 192.168.122.22 5000
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 192.168.122.22:5000.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

The successful connection confirms that the Packet I/O infrastructure is delivering traffic from the external server to the Linux application running on the router. Connect over an interface that is in the same VRF as the socket (vrf-default) to ensure reachability.

Traffic sent from the external server reaches the Linux socket on the router, confirming that the Packet I/O infrastructure is correctly routing packets to the hosted application.