How to assign IP address manually vCenter Appliance
/opt/vmware/share/vami/vami_config_net
Reboot the server
now access your vCenter Server https://192.168.1.100:5480
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 ARIZONA -7
3- Verifying NTP Configurations
GK_RTR#show ntp associations
GK_RTR#show clock
4- After you configure the Cisco router to synchronize with an NTP server, you can configure it to provide date and time information to a CUCM server and other devices,
Note :- If you want to allow your Router act as NTP server and specify specific interface to provide NTP services then you have to give command “ntp source ” before “ntp master” otherwise it will give NTP services from 127.0.0.1 .
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 Gateway IP 172.16.1.1 DNS Server 10.31.144.1
Voice VLAN IP Nework Range 172.16.2.0 Gateway IP 172.16.2.1 DNS Server 10.31.144.1
TFTP Server for Cisco Phones 172.16.2.1
GK_RTR#configure terminal
GK_RTR(config)#ip dhcp excluded-address 172.16.1.1 172.16.1.9
GK_RTR(config)#ip dhcp excluded-address 172.16.2.1 172.16.2.9
GK_RTR(config)#ip dhcp pool DATA_SCOPE
GK_RTR(dhcp-config)#network 172.16.1.0 255.255.255.0
GK_RTR(dhcp-config)#default-router 172.16.1.1
GK_RTR(dhcp-config)#dns-server 10.31.144.1
GK_RTR(dhcp-config)#exit
GK_RTR(config)#ip dhcp pool VOICE_SCOPE
GK_RTR(dhcp-config)#network 172.16.2.0 255.255.255.0
GK_RTR(dhcp-config)#default-router 172.16.2.1
GK_RTR(dhcp-config)#option 150 ip 172.16.2.1
GK_RTR(dhcp-config)#dns-server 10.31.144.1
If you are using Windows server or some other centralized device for DHCP services. Even Cisco Unified Communications Manager includes DHCP server capabilities. you need to configure ip helper-address <central DHCP server IP address> to your VLAN interface to forward DHCP requests to the central DHCP server for the voice and Data VLANs.
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 router that look like old memory SIMMs.
Cisco bundles these DSP chips into Packet Voice DSP modules (PVDM)
Cisco provides a DSP calculator that provides the number of DSP chips you need to
purchase based on the voice network you are supporting. This tool can be found at
www.cisco.com/web/applicat/dsprecal/index.html Note :- require CCO login
How to configure T1/E1 controller on Cisco 2800 router
1- check physical location of card slot to check run command
# sh diag
it will show you WIC slot no
WIC Slot 0:
VWIC2-1MFT-T1/E1 – 1-Port RJ-48 Multiflex Trunk – T1/E1
Hardware Revision : 0.0
2- initialize the E1 T1 controller card
PSTN(config)#card type ?
e1 E1
t1 T1
PSTN(config)#card type e1 ?
<0-2> Card slot number (always 0 for 1800 series & 2801 routers)
PSTN(config)#card type e1 ?
<0-2> Card slot number (always 0 for 1800 series & 2801 routers)
PSTN(config)#card type e1 0 ?
<0-3> WIC slot number (0:WIC, 1:Onboard for NM-HDV2)
PSTN(config)#card type e1 0 0 ?
<cr>
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 verify whether it is error free before troubleshooting ISDN Layer 2 problem with the debug isdn q921 command.
Symptoms :- ISDN layer 1 is active and Layer 2 going up and down with error “TEI_ASSIGNED”
There could be following missing command under signaling interface at Telco end if they are using Cisco Gateway.
isdn protocol-emulate network
interface Serial0/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
Cisco trouble shooting guides
E1 Troubleshooting Troubleshooting flowchart E1 Troubleshooting Flow chart T1
Remote Host Identification Has Changed error and solution
When we run scp command to copy data to remote host its gives us error
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Solution is
$ ssh-keygen -R {server.name.com}
$ ssh-keygen -R {ssh.server.ip.address}
$ ssh-keygen -R server.example.com
sample output
root@webserver html]# ssh-keygen -R 192.168.1.10
/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old
source ssh error
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
2- Make your server mysql password complicated
3- Make your vos3000 client Admin password complicated
4- Make your vos3000 client user access password complicated.
5- Make your buyers and seller IP authenticated
6- make your firewall on
contact for more vos3000 security and firewall ,anti hack
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 allow all
request_header_access Cache-Control allow all
request_header_access Content-Encoding allow all
request_header_access Content-Length allow all
request_header_access Content-Type allow all
request_header_access Date allow all
request_header_access Expires allow all
request_header_access Host allow all
request_header_access If-Modified-Since allow all
request_header_access Last-Modified allow all
request_header_access Location allow all
request_header_access Pragma allow all
request_header_access Accept allow all
request_header_access Accept-Charset allow all
request_header_access Accept-Encoding allow all
request_header_access Accept-Language allow all
request_header_access Content-Language allow all
request_header_access Mime-Version allow all
request_header_access Retry-After allow all
request_header_access Title allow all
request_header_access Connection allow all
request_header_access Proxy-Connection allow all
request_header_access User-Agent allow all
request_header_access Cookie allow all
request_header_access All deny all
================================
Now you will be geeting for proxy server IP address on www.whatismyip.com it will not say this is proxy server.check before and after adding above lines.
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