IP Services - Memory Builders (1)

HSRP
Hot Standby Router Protocols - is a cisco-proprietary feature by which multiple routers can provide interface IP address redundancy so that hosts using the shared, virtual IP address as their default gateway can still reach the rest of a network even if one or more routers fail. 

VRRP
 Virtual Redundancy Router Protocol - A standard (RFC 3768) feature by which multiple routers can provide interface IP address redundancy so that hosts using the shared, virtual IP address as their default gateway can still reach the rest of a network even if one or more routers fail.

>> HSRP = VRRP, One is Cisco Proprietary, others is open standard. Similar with ISL and Dot1Q

GLBP
Gateway Load Balancing Protocol - Is a cisco-proprietary feature by which multiple routers can provide interface IP address redundancy, as well as cause a set of clients to load-balance their traffic across multiple routers inside the GLBP group. 

ARP
Address Resolution Protocol - Defined in RFC 826, a protocol used on LANs so that IP host can discover the MAC Address of another device that is using particular IP address

How To Setup Linux Server on Cloud

Sometime we want to test an application into a real server. But, it dangerous if we use the production server. Yes, we need  a lab server for it. Built a new one is not cheap. We need a PC/Server, electricity, internet access, etc.
Rent a server or cloud is an effective and economic solution. Especially if the charging can on hourly based. A cloud provider which offer this service is Digital Ocean. And there is promo code $10 that worth for 2 months testing. How to get the promo code ? Simple. You can find the promo code on Facebook :

Or Twitter :

Norton Mail Scam

Today, an employee got email below :

after I clicked the url, it's not going to norton.com. it's a phishing site that collect email account and email password.

What we can learn from this case :

1. it's strange if any service from outside company said can shutdown email service that we use, although that service isn't related with our email service
2.  although email sender from any reputable company( in this case NORTON), if it asked us to