Linux FAQ

1)Enable vsftp on RedHat..

Just to start you can use
# /sbin/service vsftpd start

Following makes ftp service to start automatically on reboot

/sbin/chkconfig vsftpd on

disable vsftp
/sbin/service vsftpd stop

/sbin/chkconfig vsftpd off

2)installing ftpd BSD version


[root@singam15]# rpm -i ftpd-0.3.3-118.i586.rpm
warning: ftpd-0.3.3-118.i586.rpm: V3 DSA signature: NOKEY, key ID 9c800aca
error: Failed dependencies:
inet-daemon is needed by ftpd-0.3.3-118
netcfg is needed by ftpd-0.3.3-118
[root@singam15]# rpm -i --nodeps ftpd-0.3.3-118.i586.rpm
warning: ftpd-0.3.3-118.i586.rpm: V3 DSA signature: NOKEY, key ID 9c800aca

edit the file /etc/xinetd.d/ftpd to disable = no for enabling ftp

service ftp
{
socket_type = stream
protocol = tcp
wait = no
user = root
server = /usr/sbin/in.ftpd
disable = no
}

[root@singam15]# pwd
/lib/security
[root@singam15]# ln -s /lib/security/pam_unix.so pam_unix2.so


/sbin/service xinetd restart --> This restarts xinetd



3) To start your own script on a reboot add it to /etc/rc.local.
This script will be executed *after* all the other init scripts.

example: /opt/yourapp/bin/script &

4) TO find version name in SUSE use cat /etc/issue

Welcome to SuSE Linux 8.2 (i586) - Kernel \r (\l).

uname -r gives uname -r
2.4.20-4GB

5) disable ping respons on linux box


Many malicious attacks begin with a ping scan. Disabling ICMP echo requests prevents your system's discovery with a ping.
As superuser, add the following lines to /etc/sysctl.conf

net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_echo_ignore_all = 1

Then run the following command to cause the change to take effect immediately:

sysctl -p

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