Catalyst 3550 and IAS authorization

S?awek · 2006-03-31T09:26:38+00:00

Hi. I've got In my network environment Cisco Catalyst 3550 SMI. I set it to use Radius authorization in IAS on Windows 2003. This Cisco device and IAS Server are in diffrent VLANs (diffrent subnets) but they can ping each other (routing between VLANs are working). IAS is confiured properly but sometimes (not always) I cannot login to this switch (log from IAS is OK - user which I use was accepted by rules configured on IAS) and after putting password and for a while I have information: % Backup authentication and login is not possible (I try to login from host which is in the same VLAN as this switch). In the same time, when I try to login form host, which is in the same VLAN as IAS Server, everything goes OK. Does anybody know what can be wrong?? Regards Slawek

Mar 31, 2006 21 Replies

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Sławek 20 years ago

I found and resolve my problem. On L3 switch which is my router to VLANs communicate with I set UDP helper for RADIUS packets. And this makes so kind of troubles. So, when you have to configure UDP helper (or ip helper-address in Cisco nomenclature) you shouldn't set ports other than BOOTP/DHCP 67 regarding to

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. Regards Slawek

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