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Full Discussion: Alternate to pinging boxes
Top Forums UNIX for Advanced & Expert Users Alternate to pinging boxes Post 302150514 by porter on Tuesday 11th of December 2007 04:52:16 PM
Old 12-11-2007
If there are firewalls up you may never know if another host is up unless (a) you are allowed to talk to it (b) you use the explicit protocol it's designed to permit.

That said, however, you may have fun with "traceroute".

Also, you can try ssh to another box and run ping/traceroute from that host if you need to get around a firewall.
 

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libssh2_channel_direct_tcpip_ex(3)				  libssh2 manual				libssh2_channel_direct_tcpip_ex(3)

NAME
libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session SYNOPSIS
#include <libssh2.h> LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport); LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port); DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3) host - Third party host to connect to using the SSH host as a proxy. port - Port on third party host to connect to. shost - Host to tell the SSH server the connection originated on. sport - Port to tell the SSH server the connection originated from. Tunnel a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server remains encrypted, communication from the server to the 3rd party host travels in cleartext. RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. SEE ALSO
libssh2_session_init_ex(3) libssh2 0.15 1 Jun 2007 libssh2_channel_direct_tcpip_ex(3)
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