LDAP-Availability

Hi, last night one of our radius servers had a dying network card. I shouldn't be a problem because I've installed several servers and if one server isn't answering the switches are using the fallback servers. But the interface freeradius is using was still up - only the interface with the default gateway (= ldap access) was down. Is there any way I can prevent such a situation in the future (besides using only one interface)? A reply like "I'm temporary not available - please use another radius server" or something ;) -- Jens Weibler