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How to find the ip of ...

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Special Forums IP Networking How to find the ip of ...
# 8  
Old 11-01-2011
A subnet acts like a logical bus. As far as the machines are concerned, they're all hooked to one long wire which connects to every machine. No hosts are more or less direct than any other; handling the direction of traffic etc. becomes the switches' jobs. The switches handle this by comparing MAC addresses.

If you have advanced enough switches you may be able to pull the network organization from the switch itself, but unless it's an expensive switch that's unlikely.

If a big bus isn't the organization you want, you have to start using routers and break things into more subnets. (Router in the routing sense, not router in the linksys sense. You probably don't want NAT by the sounds of it.)
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libssh2_knownhost_check

libssh2_knownhost_check(3)					  libssh2 manual					libssh2_knownhost_check(3)

NAME

       libssh2_knownhost_check - check a host+key against the list of known hosts

SYNOPSIS

       #include <libssh2.h>

       int libssh2_knownhost_check(LIBSSH2_KNOWNHOSTS *hosts,
				   const char *host,
				   const char *key, size_t keylen,
				   int typemask,
				   struct libssh2_knownhost **knownhost);

DESCRIPTION

       Checks a host and its associated key against the collection of known hosts, and returns info back about the (partially) matched entry.

       host is a pointer the host name in plain text. The host name can be the IP numerical address of the host or the full name.

       key is a pointer to the key for the given host.

       keylen is the total size in bytes of the key pointed to by the key argument

       typemask  is  a	bitmask that specifies format and info about the data passed to this function. Specificly, it details what format the host
       name is, what format the key is and what key type it is.

       The host name is given as one of the following types: LIBSSH2_KNOWNHOST_TYPE_PLAIN or LIBSSH2_KNOWNHOST_TYPE_CUSTOM.

       The key is encoded using one of the following encodings: LIBSSH2_KNOWNHOST_KEYENC_RAW or LIBSSH2_KNOWNHOST_KEYENC_BASE64.

       knownhost if set to non-NULL, it must be a pointer to a 'struct libssh2_knownhost' pointer that gets filled in to point	to  info  about  a
       known host that matches or partially matches.

RETURN VALUE

       libssh2_knownhost_check(3) returns info about how well the provided host + key pair matched one of the entries in the list of known hosts.

       LIBSSH2_KNOWNHOST_CHECK_FAILURE - something prevented the check to be made

       LIBSSH2_KNOWNHOST_CHECK_NOTFOUND - no host match was found

       LIBSSH2_KNOWNHOST_CHECK_MATCH - hosts and keys match.

       LIBSSH2_KNOWNHOST_CHECK_MISMATCH - host was found, but the keys didn't match!

AVAILABILITY

       Added in libssh2 1.2

EXAMPLE

       See the ssh2_exec.c example as provided in the tarball.

SEE ALSO

       libssh2_knownhost_init(3) libssh2_knownhost_free(3) libssh2_knownhost_add(3)

libssh2 1.2							    28 May 2009 					libssh2_knownhost_check(3)