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Tag: cisco

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Cisco IOS – Enabling netflow

I’ve  been using Netflow to monitor network traffic since beginning of this year and still i’m a big fan. Netflow allowes you to really dig in the actual network traffic that is generated by servers (or services) and let’s you investigate traffic that should be blocked. Configuring a Cisco to export netflow statistics to a ...

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Cisco: Filtering based on AS numbers

I am currently trying to lock down a firewall with only a few accept rules for actual servers/traffic. Since there is some connectivity to the internet needed (like Windows updates and such) we need to filter this with access-lists. With these access-lists i simply create a few ‘ALLOW’ rules for actual traffic and a ‘REJECT’ ...