You want to send someone else your Snort logs for analysis, but you don't want to give them too much information about your network.
Use the obfuscate command-line switch, -O.
snort -O -c /etc/snort.conf -l /var/log
The obfuscation switch changes all IP addresses in the logs to read xxx.xxx.xxx.xxx. If you use this in combination with the -h (homenet) option, it only obfuscates the IPs within that range; all other IPs (i.e., those of the people attacking you) remain in the clear.
Snort Users Manual
Passive OS Fingerprinting
Installing Snort from Source on Unix
Logging to a File Quickly
How to Build Rules
Detecting Stateless Attacks and Stream Reassembly
Managing Snort Sensors
Generating Statistical Output from Snort Logs
Monitoring Network Performance