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Full Discussion: Test Connection to hosts
Top Forums UNIX for Dummies Questions & Answers Test Connection to hosts Post 302711521 by SkySmart on Saturday 6th of October 2012 05:46:15 PM
Old 10-06-2012
Test Connection to hosts
i have about 3500 hosts/devices which i monitor.

i monitor them from one host. we'll call this one host HOSTA. HOSTA has connectivity to all 3500 hosts/devices.

now, i have to create a backup for HOSTA. and the back up is in another state.

how do i get a list of all open ports on HOSTA so I can have them replicated on HOSTB?

please keep in mind, i wont be the one making the actual change. i just need to have the information ready to give to the necessary personnel that will be setting it up.

so the options i have in mind are:

Code:
nmap OR
netcat (nc)

how can i use either of these two commands to get all open ports that HOSTA can connect to on all 3500 hosts/devices?

for example:

lets say one of the 3500 hosts/devices i monitor is called merchant-01.skysmart.net

i'm hoping there will be a command similar to this:

Code:
nmap HOSTA merchant-01.skysmart.net

what i'll be expecting the aforementioned command to do is get me a list of ALL OPEN ports that HOSTA can connect to on merchant-01.skysmart.net. when i say all, i mean all. udp, tcp, whichever.

any ideas?

os: Linux Red Hat/SunOS
 

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LEARN ABOUT MOJAVE

hosts

HOSTS(5)						      BSD File Formats Manual							  HOSTS(5)

NAME

     hosts -- host name data base

DESCRIPTION

     The hosts file contains information regarding the known hosts on the network.  For each host a single line should be present with the follow-
     ing information:

	   Internet address
	   Official host name
	   Aliases

     Items are separated by any number of blanks and/or tab characters.  A ``#'' indicates the beginning of a comment; characters up to the end of
     the line are not interpreted by routines which search the file.

     Network addresses may either be specified for IP version 4 or version 6.  IP version 4 addresses are specified in the conventional dotted
     address notation.	IP version 6 addresses are specified using the colon-separated notation described in RFC1924.

     Host names may contain any printable character other than a field delimiter, newline, or comment character.

     The hosts file is read by mDNSResponder(8) and used to supply results for calls to getaddrinfo(3), getnameinfo(3), etc. in addition to
     results obtained from multicast and unicast DNS.

FILES

     /etc/hosts

SEE ALSO

     gethostent(3), getipnodebyname(3), getaddrinfo(3), getnameinfo(3)

     RFC1924: A Compact Representation of IPv6 Addresses.

HISTORY

     The hosts file format appeared in 4.2BSD.

4.2 Berkeley Distribution					 December 11, 1993					 4.2 Berkeley Distribution
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