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64 lines
2.9 KiB
Markdown
64 lines
2.9 KiB
Markdown
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# Frequently Asked Questions (FAQ)
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## Design
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#### Why does sing-box not have feature X?
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Every program contains novel features and omits someone's favorite feature. sing-box is designed with an eye to the
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needs of performance, lightweight, usability, modularity, and code quality. Your favorite feature may be missing because
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it doesn't fit, because it compromises performance or design clarity, or because it's a bad idea.
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If it bothers you that sing-box is missing feature X, please forgive us and investigate the features that sing-box does
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have. You might find that they compensate in interesting ways for the lack of X.
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#### Fake IP
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Fake IP (also called Fake DNS) is an invasive and imperfect DNS solution that breaks expected behavior, causes DNS leaks
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and makes many software unusable. It is recommended by some software that lacks DNS processing and caching, but sing-box
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does not need this.
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#### Naive outbound
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NaïveProxy's main function is chromium's network stack, and it makes no sense to implement only its transport protocol.
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#### Protocol combinations
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The "underlying transport" in v2ray-core is actually a combination of a number of proprietary protocols and uses the
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names of their upstream protocols, resulting in a great deal of Linguistic corruption.
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For example, Trojan with v2ray's proprietary gRPC protocol, called Trojan gRPC by the v2ray community, is not actually a
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protocol and has no role outside of abusing CDNs.
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## Tun
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#### What is tun?
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tun is a virtual network device in unix systems, and in windows there is wintun developed by WireGuard as an
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alternative. The tun module of sing-box includes traffic processing, automatic routing, and network device listening,
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and is mainly used as a transparent proxy.
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#### How is it different from system proxy?
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System proxy usually only supports TCP and is not accepted by all applications, but tun can handle all traffic.
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#### How is it different from traditional transparent proxy?
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They are usually only supported under Linux and require manipulation of firewalls like iptables, while tun only modifies
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the routing table.
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The tproxy UDP is considered to have poor performance due to the need to create a new connection every write back in
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v2ray and clash, but it is optimized in sing-box so you can still use it if needed.
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#### How does it handle DNS?
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In traditional transparent proxies, it is usually necessary to manually hijack port 53 to the DNS proxy server, while
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tun is more flexible.
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sing-box's `auto_route` will hijack all DNS requests except on [macOS and Android](./known-issues#dns).
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You need to manually configure how to handle tun hijacked DNS traffic, see [Hijack DNS](/examples/dns-hijack).
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#### Why I can't use it with other local proxies (e.g. via socks)?
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Tun will hijack all traffic, including other proxy applications. In order to make tun work with other applications, you
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need to create an inbound to proxy traffic from other applications or make them bypass the route.
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