Tuesday, May 29, 2007

My First Born Child

I was away for some time now as my first child was born a two weeks ago, i cant tell you the joy (and sleepless nights) that it brings to the house (i am sure the parents will know what i fill). So again I apologies the delay in posting new articles as my studies where delayed also, hope to get back on track soon.

Monday, May 14, 2007


SNMP Simple Network Management Protocol a set of operations that allow us to monitor our networking devices like routers switches servers printers and what ever else you can put in your network. we have today basicly 3 versions of SNMP SNMP Version 1 defined in RFC 1157 SNMPv1 security is based on communities, that are plain-text strings that allow any SNMP-based application that knows the strings to gain access to a device's management information. also there are 3 types of communities read only - you can read information from the agent read write - you can both read and modify information on the agent trap - sent by the agent according to the policy. SNMP Version 2 defined in RFC 3416, RFC 3417, and RFC 3418 called also community-string-based SNMPv2. SNMP Version 3 latest and gratest define standard: RFC 3410, RFC 3411, RFC 3412, RFC 3413, RFC 3414, RFC 3415, RFC 3416, RFC 3417, RFC 3418, and RFC 2576. this is actually the same as SNMPv2 but with Security enhacments, meaning Authentication MD5, or Message Digest 5 with digest 128 bit, and SHA1, or Secure Hash Algorithm 1 with digest 160 bit. Encryption of SNMP data itself also by using privecy with CBC-DES algorithm. SNMP use UDP port 161 for sending and receiving requests (read - write) and 162 for receiving traps from agents. the structure of the SNMP is like a tree where you have OID (object identifier) that are represented by series of integers separated with dots. here is a simle SNMP config ShiranA(config)# snmp-server community shiranrw RW ;(default is private) ShiranA(config)# snmp-server community shiranr RO ;(default is public) ShiranA(config)# snmp-server location my home address ShiranA(config)# snmp-server contact Shiran Guez ShiranA(config)# snmp-server host shiranr ;this is the destinations that the traps will be sent This is a basic config that sets SNMP enable with both read and write communities and trap server destination.

I know this is very brief article but i think it summarizes SNMP best for understanding and also you have good links to the RFC and more information for filling up the gap.

Tuesday, May 08, 2007


Written test is being revised, v3 is released on June 19th 2007 be ready to learn some new stuff!!! Get Deep into IPv6 *IPv6 Addressing and types *IPv6 Neighbor Discovery Basic *IPv6 functionality protocols *IPv6 Multicast and related Multicast protocols Tunneling Techniques *OSPFv3 *EIGRPv6 Learn some MPLS Basic *Label Switching Router (LSR) *Label Switched Path (LSP) *Route Descriptor *Label Format *Label imposition/disposition *Label Distribution And another new subject under WAN Dynamic Multipoint VPN (DMVPN)

Agilent Conferance Israel

Today I have visited Agilent Conference in Israel, I love conferences! beside the good food it is a chance for you to see what company's think is the next best thing, as far as Agilent they claim to be the world leading in Electronic Measurement and Bio-Analytical Measurement, well I love the phrase world leading (I am not saying they aren't just saying who crowned them) as every company is saying I am world leading in this or that... Any WAY Agilant as I was saying have some nice products for analyzing network nodes performance and capability, mostly (from what I saw) they come to give the developer or system people the ability to check equipment like routers and switches from layer 2 - 7 mean they chcek from STP RSTP MST and IPv4 IPv6 and IGMP MLD OSPF BGP RTP RSTP and a lot more. Why do I tell you all this?! well as we are studying to become CCIE top professional level there is in IT today, I think it is very important to be familiar not only with CISCO equipment and Technology as the world is much versatile then that. we must know how to check also that when we implement certain policy or protocol the behavior of the router or switch that we implemented the configuration is according to the manual as or even if it is not written in the manual what will happen for example if we implement both video and voice and P2P application on our network what will be the QoE (Quality of Experience) that our clients will get. as a network professional it is critical task especially in today network and in the future networks. so my advice is also look around you so when the time come and you face with a problem you will know how to attack it even if it was not on the test!!! Just few words, to open you mind :-)

Sunday, May 06, 2007

Thursday, May 03, 2007

CCIE Dynamips Part 2 out of 3

This is part 2 out of 3!

Note: I am sorry for the split as the movie was too large for 1 file upload

CCIE Dynamips Part 1

This is part 1 out of 3 that I made to show you how easy it is to start with Dynamips on linux (my choice for better preformance) fedora core 6.