Note: The general consensus seems to be that talk is
1. insecure and
2. outdated.
To install:
wget http://mirror.centos.org/centos/5/os/x86_64/CentOS/talk-server-0.17-31.el5.x86_64.rpm yum localinstall talk-server-0.17-31.el5.x86_64.rpm sudo iptables -A INPUT -p udp --dport 517 -s 127.0.0.1 -j ACCEPT sudo iptables -A INPUT -p udp --dport 518 -s 127.0.0.1 -j ACCEPTAbove I've added, but haven't yet tried, -s 127.0.0.1 to limit connections from the local computer (localhost). If it doesn't work with -s 127.0.0.1, then try without -- but then be aware of the security implications. These rules also aren't permanent and will be lost on reboot. To make them permanent, edit /etc/sysconfig/iptables.
I couldn't get talk to work before opening the ports and would get
Note that talkd uses Xinet and not init -- it will not run as memory resident daemon, but instead be launched by xinet only when talkd is needed (traffic is detected to the ports associated with talkd). Xinet.d is a bit like a concierge, waking up whomever seems to be the adressee.Error on read from talk daemon : Connection refused
Edit both /etc/xinetd.d/talk and /etc/xinetd.d/ntalk. Change to:
Finally, restart xinet.d (doing chkconfig talk on wasn't enough):# default: off # description: The talk server accepts talk requests for chatting with users \ # on other systems. service talk { flags = IPv4 disable = no socket_type = dgram wait = yes user = nobody group = tty server = /usr/sbin/in.talkd }
sudo /etc/init.d/xinet.d restart
Note: If you or the other user have several terminals open you should figure out which terminal to use. If you're user2, do
psuser1 can then doPID TTY TIME CMD 5455 pts/23 00:00:00 bash 9321 pts/23 00:00:00 ps
[user1@host ~]$ talk user2@localhost pts/23
and user2 will see the following in that terminal:
If you are user1 and have no idea on what terminal user2 is logged on, you can tryMessage from Talk_Daemon@host at 14:49 ... talk: connection requested by user1@localhost.localdomain. talk: respond with: talk user1@localhost.localdomain
w|grep user2user2 pts/8 remote:S.0 04Nov12 59:00 0.04s 0.04s /bin/bash user2 pts/9 remote:S.1 04Nov12 17:28 0.03s 0.03s /bin/bash user2 pts/10 remote Mon12 2days 0.03s 0.00s ssh -X -v volde user2 pts/11 local Mon12 2days 0.29s 0.26s perl eccejobmon user2 pts/23 remote 14:30 7.00s 0.00s 0.00s -bash
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