Tag: router
XS4ALL, Cisco 877 and IPv6
A while ago my ISP XS4ALL started with the distribution of IPv6 prefixes to their customers. So as a network engineer I wanted to have my own /48 prefix. Sadly I didn’t had time to start testing at the beginning of the IPv6 “launch”. Last week I found some time to start my testing. I … Read More
Configuration Example, Security
Import PKCS12 certificate on IOS router
Nowadays IOS routers can be configured with WebVPN (Clientless SSL VPN) functionalities. WebVPN allows a user to securely access resources on the corporate LAN from anywhere with an SSL-enabled Web browser. To secure the connection you should use a SSL certificate to encrypt all transferred data. There are different ways of creating and importing SSL … Read More
Configuration Example, Security
Configure VPN client on IOS router
One way to remotely access a network is using the Cisco VPN client. Nowadays more and more implementations of SSL VPN are being done and Cisco stopped their development on their VPN client and pushes their Cisco AnyConnect client. Still the Cisco VPN client is often used to remotely gain access to a network. The … Read More
Cisco router: determine amount of memory/flash
Somebody asked me how he could determine the amount of DRAM and flash memory on a Cisco router. I always thought that everybody would know how to determine this information, but since this isn’t matter, I will tell you how you can determine the values. You use the show version command to retrieve the requested … Read More
GNS3 supports JunOS
A lot of you will know GNS3. GNS3 is a graphical network simulator that allows simulation of complex networks. With GNS3 you can simulate multiple Cisco routers and the Cisco PIX firewall. GNS3 allows you to emulate real Cisco IOS images, design and experiment with complex networks, connect the virtual lab to the real world … Read More
Configuration Example, Routing
Policy NAT on Cisco router
A colleague of mine had to implement an IPSec VPN tunnel from a customer to a supplier. The customer has a Cisco router for connecting to the Internet, so nothing special. The router is already setup and in production. Configuring an extra IPSec VPN tunnel isn’t very hard, the most important part is the negotiation … Read More