Skip to content

Meta

  • Register
  • Log in
ItsyourIP.com

Your gateway to Internet

Primary Navigation Menu
Menu
  • About
  • Contact Me
  • Free Antivirus
  • Free Firewall
  • Sitemap

switch

How to create VLAN Interfaces for InterVLAN Routing in Cisco IOS

2008-07-01
By: admin
In: Cisco
Tagged: Cisco, cisco-switch, InterVLAn-Routing, ios, router, switch, vlan

VLAN Interfaces are required in network scenarios where you have different VLANs and need Inter-VLAN switching on Layer3 (Routing capable) switches. Every VLAN that needs to be routed should have a VLAN interface. Let’s say we have VLAN 10 which hosts the subnet 192.168.10.0 subnet, VLAN hosts 192.168.20.0 subnet and VLAN 30 hosts 192.168.30.0 subnet. For Inter-VLAN routing to work, we need to have a VLAN interface setup for each of these VLANs and configured with an IP address from the same subnet which will be the default Gateway for that subnet. Lets say, 192.168.10.254,192.168.20.254.192.168.30.254 are the IP addresses for VLAN Interfaces of VLAn 10,20,30Read More →

High CPU usage when SNMP is enabled in Cisco Routers

2008-06-19
By: admin
In: Cisco
Tagged: Cisco, CPU, High, ios, process, router, snmp, switch

Cisco Routers and Switches with L3 routing functions are seen to have problems with High CPU usage when SNMP is enabled. This can range anything from 15% to 40%. According to Cisco, these are low priority processes and other priority processes requiring CPU cycles are given priority over these processes and this level of CPU utilisation can be is normal. However, it is always better to be safe than sorry and get the CPU utilisation caused by SNMP to bare minimum so as to ensure the Routers function smoothly. The reason behind the High CPU usage can be caused by the Network Management Server (SNMPRead More →

Logging Synchronous while working in Cisco Router/Switch Console

2008-04-25
By: admin
In: Cisco
Tagged: Cisco, ios, logging, router, switch, Synchronous

Another beginner tip that can be useful! When you work on the Cisco Router or Catalyst Switch console, it would be annoying to have the console or terminal (telnet/ssh) logs to pop in between your commands. This can be even more irritating when it is busy switch or a router spitting messages continuously.Read More →

Configure Access/trunk/Dynamic modes in Catalyst switches unconditionally

2008-04-20
By: admin
In: Cisco
Tagged: catalyst, Cisco, DTP, switch, trunk

In Cisco Catalyst switches, each switchport can be set to different VLAN Membership modes using the "switchport mode" command. This sets the port unconditionally. The different modes includeRead More →

VoIP Hopper – Opensource Security tool to test VoIP

2008-04-17
By: admin
In: OpenSource, Security, voip
Tagged: Avaya, CDP, Cisco, ethernet, OpenSource, switch, VLAN-Hopping, voip, VoIP-Hopping

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. Read More →

How to set Summer Time (Daylight Savings Time) in Cisco IOS

2008-03-30
By: admin
In: Cisco
Tagged: Cisco, clock, daylight-savings, router, summer-time, switch, timezone

The Day Light savings time kicked in today in the UK today and it is this part of the year (and when the GMT kicks back in) we do a sanity check on all the Network Devices, Appliances and Servers for time. It is important to set the time appropriately on the devices as an incorrect time on the devices can cause authentication issues and ofcourse incorrect time stampls on the logs. You can enable the Day Light Savings time in Cisco IOS. This just takes a couple of commands from the Global Configuration mode.Read More →

Set Login Restrictions to protect Cisco IOS Routers & Switches

2008-03-20
By: admin
In: Cisco, Security
Tagged: audit-logs, Cisco, Enhancements, failed-logins, ios, Login, router, Security, switch

While no security is fool proof, it is important that we do as much as we can to ensure maximum protection on our netowrk devices like Routers and Switches. Cisco IOS has enhanced Login restriction features which can control login attempts to it. This includes time delay between failed login attempts, block period after a set of failed login attempts and audit logs of successful and failed login attempts. These login restrictions provides more control and make it that more harder for unauthorised accesses and prevent against Dictionary based DoS attacks.Read More →

Posts navigation

1 2 3 Next



Categories

  • ARP
  • Browser
  • Cisco
  • Database
  • Debian
  • DHCP
  • DNS
  • DNS Records
  • Firefox
  • internet-explorer
  • IP Tools
  • juniper
  • Linux
  • MySQL
  • Network Inventory
  • Networking
  • OpenSource
  • OpenSource Clustering
  • Opensource Firewall
  • OpenSource LoadBalancer
  • Opensource NAC
  • OpenSource Router
  • Opensource VPN
  • proxy
  • Python
  • Redhat
  • Secure Shell(SSH)
  • Security
  • Security Audit
  • Security/Penetration Testing
  • Sniffing/PacketCapture
  • Solaris
  • Tools
  • Ubuntu
  • Unix
  • VirtualBox
  • voip
  • vpn
  • Windows
  • Wireless

Tags

acl Browser Cisco DHCP DNS DNS Records encryption Firefox firewall gateway High-Availability icmp internet ios ip ip-address ipsec IP Tools juniper Linux mtu network OpenSource Opensource Firewall OpenSource LoadBalancer proxy Redhat registry rhel route router routers Security snmp Solaris switch tcp tcpip udp Unix virtual-server vlan vpn Windows Wireless

Recent Posts

  • MySQL: how to delete all records from a table
  • Python: Remove last ‘n’ characters of a string
  • How to block select in PuTTY
  • How to enable/disable Right-click paste in PuTTY
  • How to change the HOST key in Oracle Virtualbox Manager
  • FileZilla FTP Client configuration through BlueCoat proxy
  • Unable to delete Stale/Obsolete statc routes in Cisco IOS
  • How to create VLAN Interfaces for InterVLAN Routing in Cisco IOS
  • High CPU usage when SNMP is enabled in Cisco Routers
  • Import WyseTerm Host List from one user to another in Windows

RSS Secunia Advisories

RSS MS Security Bulletin

RSS US-CERT Vulnerability

RSS SANS

Recent Comments

  • Forwarding ICMP over a server without redirects on How to Disable ICMP Redirects in Linux for security (Redhat,Debian,Ubuntu,SuSe tested)
  • M.Pasha on How to Disable ICMP Redirects in Linux for security (Redhat,Debian,Ubuntu,SuSe tested)
  • Steve Pollard on How to prevent VLAN Hopping in Cisco Switches
  • Routing issue Sophos UTM Home <-> Cisco ASA 5510 for only linux hosts? - Sophos User Bulletin Board on How to Disable ICMP Redirects in Linux for security (Redhat,Debian,Ubuntu,SuSe tested)
  • BranchCache – Hosted Cache Mode File Server Tutorial | theezitguy on HowTo: Add persistent Static Routes in Windows

Designed using Responsive Brix Premium. Powered by WordPress.