Archive for the 'Networking' Category

 

 

Jun 06 2021

Feedback on Cisco Small Business vs Cisco

Published by under Cisco

I asked my reseller a quote for some Cisco Catalyst switches as usual, and he tells me most of his clients buy Cisco Small Business switches. He argues they are much cheaper, have similar performance and features. Checking on some forums, I get no real answers but vague statements like it is not a real […]

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May 29 2017

Determine Operating System within FTP Session

Published by under AS400,Linux,Networking

The “QUOTE” keyword is essential to allow a user to run system-specific commands on FTP servers (SITE or ALLO for example). These commands do not have to be understood by FTP clients. Most FTP clients send a NOOP – that actually is a dummy packet – to keep the connection up  QUOTE SYST returns the Operating […]

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May 06 2015

How to Deny / Force VLAN Access to a Mac Address on Cisco

Published by under Cisco,Security

Different methods exists to filter out mac addresses on a switch such as:– port security,– mac access lists or even– 802.1x port-based authentication with Radius. Mac access ACL require a higher end switch while 802.1x authentication is a pretty heavy setup and needs to manage a mac address database on a Radius server.Port security allows […]

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Oct 24 2013

Run a DHCP Relay on a Cisco Catalyst 2960 Switch

Published by under Cisco

Having a DHCP relay on a layer 2 switch is usually a nonsense. A DHCP server happened to crash and I had no access to configure a new DHCP service on the ISP router at a remote site.My only option was to set a DHCP relay on the switch that will forward requests to another […]

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May 11 2013

Freeradius Usage Graphs

Published by under Freeradius

Radius servers generate a lot of accounting records. Is it worth keeping them? Of course! Beside the fact they could be used to check if a customer was connected at a given date, or find out who got IP address X.X.X.X that same day, the most interesting is to generate Freeradius traffic usage graphs and […]

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