Nov
05
Fragmented IPv4 traffic may cause you a lot of problems in real life. Not only it increases the load on router CPUs, but also impacts applications performance (e.g. TCP needs to re-send the whole packet on a single fragment loss). In addition to that, traffic fragmentation is used in numerous network attacks, allowing an attacker to bypass firewalls or IDSes in some situations. Due to all these reasons, you may want to avoid fragmentation at all and/or ensure your network is insulated from... Read More
Dec
28
First off we need to understand that traceroute is a technique to have the routers between the source and destination reveal themselves and finally have the destination reveal itself. Traceroute can be implemented using ICMP, UDP, and even TCP so as a CCIE when someone asks you to filter "traceroute" you should get a little background as to the traceroute application/OS's being used to trigger the reply from the destination. Example: Windows uses ICMP echoes by default, most Linux OS's use UDP... Read More

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