sit0 device and SNMP

[b r u ma]

hi,

This is question for Fedora 1, not sure if this is right list, but any 
way ...

When I run
$ snmpwalk -v 1 -c public localhost ifDescr

i get this:
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: eth0
IF-MIB::ifDescr.3 = STRING: eth1
IF-MIB::ifDescr.4 = STRING: eth2
IF-MIB::ifDescr.5 = STRING: ppp0
IF-MIB::ifDescr.6 = STRING: sit0

but sometimes after reboot, ppp0 and sit0 device change order:
...
IF-MIB::ifDescr.4 = STRING: eth2
IF-MIB::ifDescr.5 = STRING: sit0
IF-MIB::ifDescr.6 = STRING: ppp0

I use SNMP to monitor traffic (MRTG) on ppp0, because of this switching, 
I'm sometimes monitoring wrong data...

Strange thing is that I never used sit0 device, also $ifconfig don't 
list it, so why is there? How do I remove it, or make it fixed?

regards bruma