Author Archives: Gkhan

How to configure Cisco router as NTP server 1- you have to obtain public NTP server addresses from www.ntp.org 2-  configure you router with NTP server IP GK_RTR#configure terminal GK_RTR(config)#ntp server 64.209.210.20 GK_RTR(config)#ntp source lo GK_RTR(config)# ntp master GK_RTR(config)#clock timezone … Continue reading →

Cisco Router as DHCP Server Using a Cisco router as a DHCP server is a somewhat common practice in smaller networks.In this example we have two VLANs one for Voice and one for DATA. DATA VLAN  IP  Nework Range  172.16.1.0 … Continue reading →

How to calculate PVDM requirement for Cisco IP Telephony DSP (Digital Signal Processors) is a chip that performs all the sampling, encoding, and compression functions on audio coming into your router .DSPs typically come in chips to install in your Cisco … Continue reading →

ISDN  T1 E1 Troubleshooting TEI_ASSIGNED ISDN Status as TEI_ASSIGNED meaning Which indicates that the PRI does not exchange Layer 2 frames with the Telco switch. Use the show controller e1 x command to first check the controller t1 circuit, and … Continue reading →

VOS3000 Hacking prevention and protection VOS3000 old versions are being hacked . its costing too much money through illegal calls . you can prevent it some level  by taking some precaution . 1-  Make your server SSH root password complicated … Continue reading →

How to customize vos3000 login page You can customize vos3000 login page by editing following files /usr/kunshi/vos3000/webclient/jsp/index.html /usr/kunshi/vos3000/webclient/jsp/js/lang_en_us.js  

How to squid proxy not detected as a proxy Edit   /etc/squid/squid.conf and add the following lines ====== via off forwarded_for off request_header_access Allow allow all request_header_access Authorization allow all request_header_access WWW-Authenticate allow all request_header_access Proxy-Authorization allow all request_header_access Proxy-Authenticate … Continue reading →