Firstly, Nat 0 and static can be used to achieve the same result of bypassing NAT, at least logically 🙂 However both are fundamentally different. Take a look at the following example: nat (inside) 0 192.168.1.1 255.255.255.255 and static (inside,dmz)…
The inside interface of the PIX (also applies to ASA) cannot be accessed from the outside or from the other side of the VPN tunnel unless the management-access is configured. Once management-access is enabled, Telnet, SSH, or HTTP access must…
When setting up a Cisco ASA failover pair, try to follow the following rules & tips: Do not use a crossover Ethernet cable or a fiber-optic patch cable to directly connect the two failover LAN interfaces if the firewalls are…
VMWare ESXi 3.x is a free version and lightweight version of the VMWares ESX platform. It supports most of the key features that ESX has but comes in appliance like package which doesn’t let you configure anything more than just…
If you are having issues routing your traffic within the inside interface, or hair-pining your traffic, chances are you need to enable the “same-security-traffic permit intra-interface” command. Take a look at the picture below which explains this problem: Basically when…
A lot needs to be considered when planning for a datacenter. Power, cooling, UPS, generators, rack space, cost. All these come into play. Here are a few links to some vendor calculators I came across that has helped me. DELL…
Have you ever wondered how to query the architecture (32bit or 64bit) or rpm version that is installed on your Linux system? Has a DBA ever come to you and asked the following: “Why is my Oracle Linux server missing…
iSCSI or internet SCSI is a standard for running SCSI over an ip based network. For people familiar with this technology it basically enables you to mount remote disks over your existing IP infrastructure. Today I setup a simple iSCSI…
Today I setup vsftp for local user ftp access. I turned on ‘chroot_local_user=YES’ which essentially puts the ftp user into a vsftp chroot jail. But what happens when you want to access something outside of user’s home directory? What? Symlinks…
VMware – The leading industry Virtualization Provider. It comes in two flavors VMWare ESX and VMWare Server (formerly GSX). The former comes at a cost and the latter FREE! In a low cost setup Vmware server (Free version) is the…