I've some Linux systems with different telnet executables. These telnet differ slightly in size (67776 vs. 65360), and the use of libncurses.so (.6 vs .5).
My problem is that one of them makes an DNS lookup for each host, even if given as IP-address. This is annoying, 'cause it may timeout after 20 seconds.
Keep in mind that this has nothing to do with a DNS server and/or /etc/hosts and/or /etc/nsswitch.conf 'cause it happens always for the one telnet and not for the othet on the same machine.
Does anybody know when this behaviour was changed, and if there is a possibility to switch it of (lik it was possible in ancient SunOS4.x)?
Where are the sources of telnet?