Cisco IOS has statefull firewall features like reflexive access lists. By using this feature, you can use your Cisco router as a second firewall (the choke point concept in Cisco firewall trainings) and increase your network security by layered approach.
You can use an access control list (ACL) for the filtering one way traffic, but what about the responding packages. You have to add an incoming ACL and it should include only sessions started from inte...
I mentioned about basic SSH setting in SSH@Cisco article. But I saw that there are other questions about SSH settings, so, I decided to dive a bit deeper. The settings mentioned below are tested with IOS 12.4, but I am not sure about exact version that supports below features.
Q1. What happens if I changed hostname or ip domain name after SSH settings has been done?
A1. Nothing. You need them to create rsa keys but, but afterwards, if you change them, on...
I want to show a basic BGP configuration for Internet access. In our case, we have two carriers (Sprint & Level3) and we act as an enterprise company, which needs reliable Internet access.
As a precondition we need an Autonomous System Number (ASN) and an IP address block assigned to us. We have to apply ARIN / RIPE / APNIC / LACNIC / AFRINIC for this purpose. We assume that we have 6767 as our AS number and 193.93.93.0/24 as our official IP block...
Overview
The first impression of Cisco 3845 router on me was that I felt it is too heavy.So, do not try to install it to rack alone. It has two internal power supplies (one by default). Don’t forget to order the redundant one, if you plan to run it for critical business.
The LAN connection is also redundant with two build-in Gigabit Ethernet interfaces. The good thing the GE 0/0 interface has SFP option. You can reach the far LAN Edge points on...
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