2010/05/12
Send/Recieve email using Telnet
Send mail through SMTP using Telnet
Telnet to the server via port 25.
1. Type “EHLO example.com” and hit enter.
2. “MAIL FROM: sender@domain.com” and hit enter.
3. “RCPT TO: recipient@domain.com” and hit enter.
4. “DATA” and hit enter.
5. Type your message body and hit enter.
6. Key in ” . ” and press enter to exit.
You will recieve the mail.
==============================================
Example:
root@test.com]# telnet 192.168.0.25 25
Trying 192.168.0.25...
Connected to 192.168.0.25 (192.168.0.25).
Escape character is '^]'.
220 test.tt.example.com ESMTP MAIL Service, Version: 5.0.2195.6713 ready at Thu, 3 Apr 2008 15:39:17 +0800
EHLO Vsource.com
250-smtp11.klk.example.com Hello [192.168.0.192]
250-AUTH GSSAPI NTLM LOGIN
250-AUTH=LOGIN
250-TURN
250-ATRN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250 OK
MAIL FROM: abhi@example.com
250 2.1.0 abhi@example.com....Sender OK
RCPT TO: abhi_tt@example.com
250 2.1.5 abhi_tt@example.com
DATA
354 Start mail input; end with .
this is a test over SMTP
.
250 2.6.0 Queued mail for delivery
quit
221 2.0.0 smtp11.klk.example.com Service closing transmission channel
Connection closed by foreign host.
[root@test.com]#
2010/04/21
How to set multiple IP addresses using Linux command line
Go to /etc/sysconfig/network-scripts
Make multiple copies of ifcfg-eth0 and name them as ifcfg-eth0:0, ifcfg-eth0:1 etc.
Open each of them and at least change the IPADDR to your chosen IP address and the NETMASK to the subnet mask for that IP address.
A sample entry would look like this:
Restart the network:
/sbin/service network restart
/etc/init.d/ipaliases restart (for cpanel servers)
If you have more than 100's of IP, it is difficult to choose above method. For that you can try the following method.
Add this content to the file:
Explanation:
IPADDR_START – the first IP of the class you want to add
IPADDR_END – last IP of the class you want to add
CLONENUM_START – the number with which the virtual interface will start, this will create the virtual interfaces eth0:1 to eth0:28.
If you have more classes that you want to add on the next class CLONENUM will start at 29.
NETMASK – the mask for the IP class
After all this was added to the file and edited accordingly just save and restart the network.
.
Make multiple copies of ifcfg-eth0 and name them as ifcfg-eth0:0, ifcfg-eth0:1 etc.
Open each of them and at least change the IPADDR to your chosen IP address and the NETMASK to the subnet mask for that IP address.
A sample entry would look like this:
DEVICE=eth0:0
BOOTPROTO=static
IPADDR=34.123.111.21
NETMASK=255.255.255.0
ONBOOT=yes
Restart the network:
/sbin/service network restart
/etc/init.d/ipaliases restart (for cpanel servers)
If you have more than 100's of IP, it is difficult to choose above method. For that you can try the following method.
[root@server ~]#d /etc/sysconfig/network-scripts/ – this is where the network settings are being searched for [root@server network-scripts]# vi ifcfg-eth0-range0 – this will be the file where we define the new IP class(considering that our main interface is called eth0)Add this content to the file:
IPADDR_START=192.168.0.1
IPADDR_END=192.168.0..28
CLONENUM_START=1
NETMASK=255.255.255.240Explanation:
IPADDR_START – the first IP of the class you want to add
IPADDR_END – last IP of the class you want to add
CLONENUM_START – the number with which the virtual interface will start, this will create the virtual interfaces eth0:1 to eth0:28.
If you have more classes that you want to add on the next class CLONENUM will start at 29.
NETMASK – the mask for the IP class
After all this was added to the file and edited accordingly just save and restart the network.
.
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