snort upgrade and odd logs

[barry <Barry.Haycock () b-online com au>]

i have just upgrade snort from 1.8.6 to 1.9.0 along with all the 
oppropriate rule files
the upgrade went fine and i created a new snort.conf file.

but what i have seen since the upgrade and i cannot resolve is traffic that 
is classed as internal is appearing
in the log files and within acid.

i have set ( and these are examples only)
var HOME_NET [192.168.1.0/24, 192.168.10.0/24]
var EXTERNAL_NET any

what i am seeing is what the system is reporting as port scans coming from 
webservers in the 192.168.1.0/24 address space to hosts outside. snort is 
reporting that these portscans are being done
from port 443/53 amongst other ports. now port 443 is being used for ssl on 
these same machines.
plus i am seeing smnp traffic that is talking between hosts on both 
subnets. this traffic should be there but
according to the rules as above i shouldn't be seeing it.

i have checked the rule for snmp and it states that anything from external 
-> internal

i have scanned the machines for a root kit and haven't found anything. all 
of these machines are behind a firewall that only speciffic ports open to 
the hosts.

any ideas?

baz



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