[citation needed] Normally, firewalls are designed to permit or deny network transmissions based upon a set of rules.
RTelnet utility provides functionality of telnet while maintaining the security requirement of firewall and NAT.
Though the utility differs very much from its counterpart in implementation, it behaves almost indistinguishably to users in terms of command interface and communication scheme.
[citation needed] When RTelnet starts, it prints its version number and the name or IP address of its default SOCKS proxy server to stderr stream channel.
[citation needed] RTelnet is a listed project on SourceForge code repository.