03-20-2020
VPN stands for virtual private network. The virtual means that this privacy is accomplished allthough it is by nature not private at all when you communicate over a public network - the internet. The data flows through all kinds of networks. All of them being owned and operated by someone else than you or your company, so from a privacy point of view: Those networks can not be trusted. So the virtual privacy is being achieved by strong encryption. This creates the methaphor that is a private network because only allowed people are connected or configured to enter the encrypted space.
There are lots of software packages and some different protocols that are used to operate VPNs.
The count of software packages are plenty. The protocols are relatively few, like:
- IPSec
- OpenVPN
- wiregard
- Closed source vendor specific implementations, created completely on their own or based on one of the above
The different properties of a vpn solution are:
- Manageability(Tools to manage Access and Accounts and Distribution)
- Compatibility with protocols(as shown above)
- Closed Source/Open Source
- Commercial products usally introduce their own hardware product series to be used with the VPN software
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LEARN ABOUT SUSE
tnm::netdb
netdb(n) Tnm Tcl Extension netdb(n)
__________________________________________________________________________________________________________________________________________________
NAME
netdb - Access the local network databases.
_________________________________________________________________
DESCRIPTION
The netdb command provides access to network information that is stored in configuration files, the Network Information Service (NIS) or in
the Domain Name System (DNS). The results of the netdb command usually depend on the local configuration of your operating system.
NETDB COMMAND
netdb hosts
netdb hosts name address
netdb hosts address name
The first version of the netdb hosts command returns a list of all locally known hosts. Each element of this list contains a host
name and its IP address. The result is an empty list on many systems that are configured to use the DNS for hostname lookups. The
second version of the netdb hosts command converts an IP address into a host name and the third version of the netdb hosts command
converts a host name into an IP address.
netdb networks
netdb networks name address
netdb networks address name
The first version of the netdb networks command returns a list of all locally known networks. Each element of this list contains a
network name and the IP network address. The second version of the netdb networks command returns the network name that belongs to
the IP network address and the third version of the netdb networks command returns the network address that belongs to a given net-
work name.
netdb protocols
netdb protocols name number
netdb protocols number name
The first version of the netdb protocols command returns a list of all locally known Internet protocols. Each element of this list
contains a protocol name and its protocol number. The second version of the netdb protocols command returns the protocol name that
belongs to number and the third version of the netdb protocols command returns the protocol number that belongs to a protocol name.
netdb services
netdb services name number protocol
netdb services number name protocol
The first version of the netdb services command returns the list of all locally known services. Each element of this list contains a
service name, the service number and the transport protocol. The second version of the netdb services command returns the service
name for the service described by number and protocol. The third version of the netdb services command returns the protocol number
for the service described by name and protocol.
netdb sunrpcs
netdb sunrpcs name number
netdb sunrpcs number name
The first version of the netdb sunrpcs command lists all locally known Sun RPCs. Each element of this list contains a RPC name and
its registration number. The second version of the netdb sunrpcs command returns the RPC name for a given RPC number and the third
version of the netdb sunrpcs command returns the RPC number for a given RPC name.
netdb ip class address
netdb ip range address mask
The first version of the netdb ip command returns the IP class of the given address. The following classes are recognized: A, B, C,
D and loopback. The second version of the netdb ip command returns the list of IP addresses in the address range given by address
and mask.
SEE ALSO
scotty(1), Tnm(n), Tcl(n)
AUTHORS
Juergen Schoenwaelder <schoenw@cs.utwente.nl>
Tnm netdb(n)