How to update Centos 5 .X and cannot find a valid baseurl for repo

How to update Centos 5 .X and cannot find a valid baseurl for repo

If you are using CentOS 5.x and want to install any software and update CentOS 5.x  . you are getting following error .

root@server1 [~]# yum update -y
Loaded plugins: fastestmirror
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base

This is because update repositories were moved to the CentOS vault when the operating reached it's end-of-life.

Edit the following file

Continue reading How to update Centos 5 .X and cannot find a valid baseurl for repo

vos3000 illegal calls query to block IP address

vos3000 illegal calls query to block IP address

All call records are saved in e_cdr_files

you can query to get ip addresses of illegal calls source.

mysql> select DISTINCT callerip from e_cdr_20180818 where endreason = ‘-9’;
+—————-+
| callerip |
+—————-+
| 195.154.93.229 |
| 50.2.187.130 |
| 5.62.63.181 |
| 216.244.84.202 |
| 37.49.231.161 |
| 88.198.57.146 |
| 37.49.231.63 |
| 50.22.52.22 |
| 93.190.143.70 |
| 216.244.73.98 |
+—————-+
10 rows in set (0.00 sec)

if someone can write a script to get IP address from current date CDR  for every 5 min and update the iptables automatically.

How to configure Mikrotik DHCP Server for Cisco Phone TFTP option

How to configure Mikrotik DHCP Server for Cisco Phone TFTP option

1- Change your TFTP server IP in to hex code

you can use this online tool : http://www.miniwebtool.com/ip-address-to-hex-converter/

2- Now configure Mikrotik RouterOS :

/ip dhcp-server option add code=150 name=ciscotftp value=0xC0A80307

Continue reading How to configure Mikrotik DHCP Server for Cisco Phone TFTP option

How to install VMware tools in Linux Virtual Machine

How to install VMware tools in Linux Virtual Machine

  1. Make sure Linux virtual machine is powered on.
  2. Click VMin the virtual machine menu, then click Guest > Install/Upgrade VMware Tools.
  3. Click OK.Note: In some cases, verify that the CDROM device is Connectedfrom within the Edit Settings option of the virtual machine.
  4. To create a mount point, run:mkdir /mnt/cdrom
  5. To mount the CDROM, run:mount /dev/cdrom /mnt/cdrom
  6. Continue reading How to install VMware tools in Linux Virtual Machine

OpenVPN CRL has expired

OpenVPN CRL has expired

VERIFY ERROR: depth=0, error=CRL has expired: CN=servername

In order to fix the issue, we just need to recreate the crl.pem file.

we need  to backup the current crl.pem file before creating a new one.

The location of the  crl.pem file  at /etc/openvpn/

#mv  crl.pem  crl.pem.back

Now go to  easy-rsa  folder

# cd  easy-rsa

now generate crl.pem

./easyrsa gencrl

Now copy the new crl.pem to openvpn folder

# cp pr /etc/openvpn/easyrsa/pki/crl.pem

Now restart openvpn service

 

source link :- https://www.jobishmathew.me/openvpn-crl-has-expired/

OPENVPN Logs

OPENVPN Logs
To troubleshoot connection issues check below logs

grep the client name  in /var/log/messages
# grep VPN    /var/log/messages

Check the connection time

#cat /etc/openvpn/openvpn-status.log

Check the connection negotiation activity

# tail -f /var/log/messages

 

VMware OS Optimization Tool

VMware OS Optimization Tool

The VMware OS Optimization Tool helps optimize Windows 7/8/2008/2012/10 systems for use with VMware Horizon View. The optimization tool includes customizable templates to enable or disable Windows system services and features, per VMware recommendations and best practices, across multiple systems. Since most Windows system services are enabled by default, the optimization tool can be used to easily disable unnecessary services and features to improve performance.

You can perform the following actions using the VMware OS Optimization Tool:

  • Local Analyze/Optimize
  • Remote Analyze
  • Optimization History and Rollback
  • Managing Templates

Download latest  VMware OS Optimization Tool

iptables port forwarding

iptables port forwarding

I am port forwarding  public ip x.x.x.x  to private ip 192.168.200.200  .

iptables -A INPUT -i eth0 -p tcp –dport 5001 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp –sport 5001 -m state –state ESTABLISHED -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp –dport 5001 -j DNAT –to-destination 192.168.200.200:5001

Continue reading iptables port forwarding