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Survival-Guides/Snowflake-Bridge-Installation-Guide.md
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We reserve different localhost IP address ranges for different purposes. This is to mitigate problems with ephemeral port exhaustion when there are many live connections. (See tpo/anti-censorship/pluggable-transports/snowflake#40198, tpo/anti-censorship/pluggable-transports/snowflake#40201.)
The purpose of each address range is listed in the table below. "⁎" stands for a random IP address octet, or a random ephemeral port.
The purpose of each address range is listed in the table below. "\*" stands for a random IP address octet, or a random ephemeral port.
|Address range|Purpose|Where configured|
|-------------|-------|----------------|
|127.0.0.1:10000 |HAProxy listen port (dialed by snowflake-server)|`bind` in haproxy.cfg, `TOR_PT_EXTENDED_SERVER_PORT` in snowflake-server.service|
|127.0.1.⁎:⁎ |snowflake-server source address when dialing HAProxy|`orport-srcaddr` in `TOR_PT_SERVER_TRANSPORT_OPTIONS` in snowflake-server.service|
|127.0.2.<var>N</var>:⁎ |HAProxy source address when dialing extor-static-cookie instance <var>N</var>|`source` in haproxy.cfg|
|127.0.1.\*:\* |snowflake-server source address when dialing HAProxy|`orport-srcaddr` in `TOR_PT_SERVER_TRANSPORT_OPTIONS` in snowflake-server.service|
|127.0.2.<var>N</var>:\* |HAProxy source address when dialing extor-static-cookie instance <var>N</var>|`source` in haproxy.cfg|
|127.0.3.<var>N</var>:10000|extor-static-cookie instance <var>N</var> listen port (dialed by HAProxy)|`ServerTransportListenAddr` in torrc, `server` in haproxy.cfg|
|127.0.4.<var>N</var>:⁎ |tor instance <var>N</var> ExtORPort (dialed by extor-static-cookie)|`ExtORPort` in torrc|
|127.0.5.⁎:⁎ |extor-static-cookie source address when dialing tor ExtORPort|`orport-srcaddr` in `ServerTransportOptions` in torrc|
|127.0.4.<var>N</var>:\* |tor instance <var>N</var> ExtORPort (dialed by extor-static-cookie)|`ExtORPort` in torrc|
|127.0.5.\*:\* |extor-static-cookie source address when dialing tor ExtORPort|`orport-srcaddr` in `ServerTransportOptions` in torrc|
## General system setup
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