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DNS pollution learning from V2Ray: take GFW as an example
Usually Cloud provider’s DNS resolution can resolve domain to IP outside China. But GFW will catch such traffic and redirect such DNS query to a wrong IP address to make access to International forbidden. This can be realized because dns query is just UDP, just send/receive. Capture and fake one response is relatively simple. The…
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nslookup && dig && traceroute
nslookup nslookup can be used to query the ip for the speicific domain Non-authoritative annswer means this is queried against local dns cache. Dig dig is used more often since it can provide more details The HEADER section is the information received from server. The Question section is the information sent to the dns server…
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Some useful websites [1]