networktechblog

For guys who like netdisco in my old post(http://bejoybkn.blogspot.in/2012/02/setting-up-netdisco-on-your-network.html) but did nt like the UI here is the version 2 with awesome UI and look.This tool is a killer with the enhanced front end and with much more capabilities Here are couple of things this tool can get easily a)Network Topology Mapb)Locate a Mac,IP address … Continue reading Netdisco 2:-Discover your LAN,IP Address,Mac,Switch port,Server Port and every thing.

Hello Friends, So long we have been running with couple of different  ISP’s and enables IP SLA and tracker.But we could not use both links as ACTIVE-ACTIVE. Recently we were able to procure a /24 public subnet from APNIC.We have thus implemented BGP announcing our public subnets through 2 ISP’s and we achieved active-active WAN … Continue reading BGP multihoming with 2 ISP’s and 2 Cisco Routers(with APNIC Public ip Pool)

Hello Friends, I have been using different open source tools though out my career like Nagios,MRTG,RANCID,NETDISCO etc but when you talk about deep level interface level monitoring every thing turned out to be useless.For example if you want to see the live traffic on an interface of your Router MRTG cant get you that since … Continue reading Best open source network tool i have ever come across:-Observium

Hello All, I had a scenario for one of my clients.They have 2 internet links terminated on their Cisco ASA 5540 and one interface connecting to Inside LAN.They wanted to use one internet interface for site to site vpn’s with their other DC’s and second internet interface for static NAT and for handling global PAT … Continue reading Cisco ASA With 2 Internet interfaces one for VPN and second for NAT/Outbound traffic

There are lots of netflow collectors available in the open source market as well as in the commercial market.NTOP is one of my favorite open source tools where as manage engine on the other side.Now setting up these tools on Windows or Linux is like cake walk as there are lots of How To docs available for … Continue reading Configuring Cisco ASA and Cisco 6500 for netflow collection

Hello, We have connectivity to couple of Amazon VPC’s from datacenter.Say to amazon sunnyvale,amazon singapore,amazon east virginia,amazon sap paulo etc.So far so good every thing works well.But later we had a requirement to interconnect amazon sunnyvale and sap paulo. Here are the challenges. a)amazon does not supports interconnection of 2 VPC’s directly.so we have to interconnect the … Continue reading Interconnect 2 amazon vpc’s super quickly

We had a requirement to connect to amazon vpc instances from our Datacenters.So amazon gives you the SVTI with BGP configuration with 2 tunnels to connect to them.But we wanted to have hardware redundancy.So this is what we did. a)We have 2 core switches which talks through a trunk link.b)2 Routers have been setup (3800 … Continue reading How to setup redundant amazon vpc connection(using ebgp,OSPF and SVTI)

Hello Friends, I had a scenario some time before.I used to sit in our Head Office where majority of the users are sitting.Nearly 500+.We also had MPLS/T1 connection to our branch offices in US,UK and Japan.We had setup remote access vpn on our Cisco ASA firewall at our HQ office.All users connects to HQ using … Continue reading How to access remote network subnets using remote access vpn

Hello, Now we have setup Nagios with Nconf(http://bejoybkn.blogspot.in/2012/06/setting-up-nagios-monitoring-with-nconf.html) You would be wondering what are all the mostly and widely used OID’s to monitor your network devices. Here are a quite few of them Device Monitoring Parameter OID Cisco ASA Firewall CPU .1.3.6.1.4.1.9.9.109.1.1.1.1.5.1 Cisco ASA Firewall Memory 1.3.6.1.4.1.9.9.48.1.1.1.6.1,1.3.6.1.4.1.9.9.48.1.1.1.5.1 Cisco ASA Firewall Connection Count .1.3.6.1.4.1.9.9.147.1.2.2.2.1.4.40.6 Cisco ASA … Continue reading Essential SNMP OID’s to monitor your network using Nagios