On Wed, 28 Jul 2004 14:25:03 +0000 "ssoss S" <sctssoss@xxxxxxxxxxx> wrote:
hi.. I found that I cannot telnet my linux box (fedora core1) via port 25 (SMTP) but the SMTP service is started. I can telnet to localhost via port 25. May I know where is the config to control and allow me to telnet mylinux 25 from other hosts??
FYI, my sendmail version is
[root@watcher root]# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 watcher.teasin.com ESMTP Sendmail 8.12.10/8.12.10; Wed, 28 Jul 2004 22:19:17
+0800
i think you can use 3 options :
1. maybe you can try use tcpwrappers
please open /etc/hosts.allow
if you want allow computer with ip address 192.168.0.5 to access telnet on your host
write :
telnetd:192.168.0.5
and open too /etc/hosts.deny to set default anything access is restricted
write:
ALL:ALL
2. or you can use xinetd
open /etc/xinetd.d/telnetd
# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
flags = REUSE
log_on_failure += USERID
disable = yes
socket_type = stream
user = root
server = /usr/sbin/in.telnetd
wait = no
only_from = 192.168.0.5
}
3. or you can use iptables
#/sbin/iptables -A INPUT -p TCP -s 192.168.0.5 --dport 23 -j ACCEPT
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