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In: OpenSource, Security, voip
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VoIP Hopper is a Unix/Linux based free opensource security tool that rapidly runs a VLAN Hop into the Voice VLAN on specific Ethernet switches. VoIP Hopper mimicks the behavior of an IP Phone, in both Cisco and Avaya IP Phone environments to hope into the Voice VLAN.  VoIP Hopper is both a VLAN Hop test tool and a tool to test VoIP infrastructure security.  If you’re new here, you may want to subscribe to my RSS feed. Thanks for visiting!Read More →

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In: Cisco, Security
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A malicious user can easily gain access to data on another VLAN to which he is not authorised to access using VLAN hopping. A VLAN Hoping attack can be launched by using a Switch Spoofing or Double Tagging of 802.1q trunking protocol. To have a quick insight into VLAN Hopping, click here. You can prevent VLAN Hopping in Cisco Switches as follows:Read More →

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In: Security
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VLAN Hopping is a Layer 2 security exploit by which a malicous user connected to a switchport on a Switch assigned to a VLAN can hop on and gain access to another VLAN which otherwise is not accessible. This security exploit allows the malicous hacker to bypass the IP Securities implemented at Layer 3.Read More →

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In: Cisco, Security, vpn
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Virtual Private Network (VPN) is a network which uses a shared network infrastructure (Internet) which allows a secure access between two networks or securely connects a remote user to his corporate network. Let's check out here how to configure a Site to Site VPN using a Pre-shared Key in Cisco Routers running Cisco IOSRead More →

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In: juniper, Security, vpn
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If you have site to site IPSec VPNs configured between two network with your Juniper Netscreen or SSG firewalls and clients from one network access servers or services from the other network then it is advisable to enable Path MTU Discovery support on the Juniper firewalls. Juniper Netscreen or SSG firewalls running Screen OS by default disable the Path MTU Discovery support. This means, when an IP Packet with DF bit set ("1") in the ip Header and its size after IPSec Encapsulation is more the MTU of the Juniper VPN Firewall arrives at the VPN Firewall, the firewall will ignore the "DF" bit andRead More →

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In: IP Tools, Security, Security/Penetration Testing
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Yersinia is a free Network Penetration testing tool used to test and analyse some of the most commonly used protocols on your network. Penetration testing tools of this kind will provide deep insight on network security issues. Yersinia is a UNIX based tool that works on Linux, Solaris 8, FreeBSD. NOTE: The tool is described as a tool to perform network tests and exercise responsible actions when performing tests which includes obtaining the permission from responsible authorities. DO NOT USE THIS TOOL FOR ANY UNAUTHROSIED HACKING PURPOSESRead More →