# Anonymity Considerations When designing and implementing a Pluggable Transport, care should be taken to preserve the privacy of clients and to avoid leaking personally identifying information. Examples of client related considerations are: - Not logging client IP addresses to disk. - Not leaking DNS addresses except when necessary. ```text - Ensuring that "TOR_PT_PROXY"'s "fail closed" behavior is implemented correctly. ``` Additionally, certain obfuscation mechanisms rely on information such as the server IP address/port being confidential, so clients also need to take care to preserve server side information confidential when applicable.