Cisco Hacks: Tips, tricks and articles about Cisco products...

Problems Accessing Microsoft Sites

After one of our sites started using a 2801 (with ADSL WIC) for internet access some of our users strated complaining they could not longer access MSN and Hotmail. It was a bit puzzling at first since you could ping these sites but could not access them via a web browser. The problem was the MTU setting.
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ADSL Downstream Connection Speed

Ever wondered what was downstream speed of your ADSL connection? You can get this as well as other useful information for troubleshooting physical connection problems (like Noise Margin, Attenuation and Output Power) with the
show dsl interface ATM command.
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Allow ICMP through the ASA

Both ping and traceroute are useful tools in troubleshooting network problems but "out of the box" these tools do not work with the ASA. The reason for this is simple, these tools all use ICMP that is blocked by the ASA.
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ASA Security Levels

Configuring an ASA can be a dauting task if you are not familiar with some concepts that are key to the operation of the device. One such concept is that of security levels.
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ASA Release 7.2(2) and Gmail

Recently we upgraded our ASA to software version 7.2(2) and all of a sudden I started to get compliants from users that they were unable to receive email from Gmail with attachments.
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ICMP Redirect on an ASA

Recently we upgraded our old FreeBSD firewall to a Cisco ASA5520 and I noticed that ASA does not generate ICMP Redirects if it is used as the "default router" or gateway for a network.
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Setting up Sub Interfaces to connect to multiple VLANs

Have you ever want to setup sub interfaces on your router so that you can connect multiple VLANs on one physical ethernet port?
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Cisco to acquire WebEx

Cisco has agreed to buy WebEx for something in the order of $3.2 billion, guess so much for any future collaboration with Microsoft for "Live Office".