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21 lines
972 B
Markdown
21 lines
972 B
Markdown
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# FakeIP
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FakeIP refers to a type of behavior in a program that simultaneously hijacks both DNS and connection requests. It
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responds to DNS requests with virtual results and restores mapping when accepting connections.
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#### Advantage
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* Retrieve the requested domain in places like IP routing (L3) where traffic detection is not possible to assist with routing.
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* Decrease an RTT on the first TCP request to a domain (the most common reason).
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#### Limitation
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* Its mechanism breaks applications that depend on returning correct remote addresses.
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* Only A and AAAA (IP) requests are supported, which may break applications that rely on other requests.
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#### Recommendation
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* Do not use if you do not need L3 routing.
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* If using tun, make sure FakeIP ranges is included in the tun's routes.
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* Enable `experimental.clash_api.store_fakeip` to persist FakeIP records, or use `dns.rules.rewrite_ttl` to avoid losing records after program restart in DNS cached environments.
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