ZyNOS (ROM-0) Exploit

Recently, I came across the interesting article that nicely explained how to bypass authentication for some SoHO routers running ZyNOS proprietary operating system. Those routers allow to download the Romfile backup file rom-0 without any authentication. The rom-0 file can be decompressed by lzs compress and decompress tools  credentials displayed  using strings command. I decided to write Bash script […]
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Building Linux L3 switch/router on x86 - Part9 - DHCP and Samba server Installation and Configuration

This is the last from the series of tutorials that shows building Linux Layer 3 switch on x86 hardware. The tutorial explains DHCP server installation and configuration on CentOS in order to provide IP addresses to the host on LAN. As the switch has enough hard disk space available we will install and configure Samba […]
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Building Linux L3 switch/router on x86 - Part8 - DNS Cache Server Installation and Configuration

So far we have installed CentOS on x86 hardware, installed Open vSwitch and connected wireless and wired LAN users to our Linux Layer 3 switch. Then we connected the switch to the Internet, enabled NAT and packets filtering. We configured the switch to synchronize its time with public NTP servers and provide time to host […]
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Building Linux L3 switch/router on x86 - Part7 - DDNS and NTP Installation and Configuration

In a previous tutorial we configured firewall and NAT on Linux Layer 3 switch to allow connection of LAN users to the Internet. We will continue building Linux L3 switch with configuration NTP and Dynamic DNS services on the switch. The switch will synchronize its time with public NTP server over the Internet and provide […]
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Building Linux L3 switch/router on x86 - Part6 - Connecting Box to the Internet - NAT and Firewall Configuration

This is another tutorial from the series of tutorials that describe building Linux Layer 3 switch on x86 hardware. In a previous tutorial we connected our switch to the Internet via routed port. To connect LAN users to the Internet we have to configure NAT and firewall on the switch. The article shows firewall and […]
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Building Linux L3 switch/router on x86 - Part5 - Connecting Box to the Internet - PPPoE Configuration

So far we have installed Linux CentOS on a computer, created an access point for wireless users connection and configured Open vSwitch to connect wired LAN users. Now it is time to step forward and connect our Linux L3 switch to the Internet. To do this, we have to install and configure PPPoE. PPPoE stands […]
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Building Linux L3 switch/router on x86 - Part4 - Openvswitch Installation and Configuration

In a last tutorial we switched our Linux layer 3 switch to wireless Master mode in order to provide wireless services to wireless LAN users.We will continue with building our Linux L3 switch and install Open vSwitch on CentOS in order to connect wired LAN users. The introduction tutorial, the list of software and hardware requirements […]
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Building Linux L3 switch/router on x86 - Part3 - Wireless Access Point Installation and Configuration

We will continue with building our Linux Layer 3 switch with another tutorial that explains installation and configuration secure Wireless Access Point – AP for wireless LAN users. AP will be configured to use secure WPA2 protocol for client authentication, using Preshared key – PSK. Traffic between AP and clients will be encrypted using modern […]
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Building Linux L3 switch/router on x86 - Part2 - CentOS 6.0 installation

This is the second from the series of step-by-step tutorials that describe building Linux Layer 3 home switch/router on Linux. The tutorial shows CentOS 6.0 installation and software RAID 1 – disk mirroring configuration. 1. Download CentOS-6.0-i386-minimal ISO image Choose the nearest download mirror for your location. $ wget ftp://tux.rainside.sk/centos/6/isos/i386/CentOS-6.0-i386-minimal.iso 2. Burn CD image with burning software […]
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Building Linux L3 switch/router on x86 - Part1 - Introduction

1. What is your tutorials about building L3 switch offering? Frankly, nothing. But if you want to learn how to build our own Linux Multilayer switch/router from scratch, the next several tutorials might help you. 2. Why should I waste my time on reading? Firstly, it is about getting knowledge. Even if you are an experienced Linux […]
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