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bitcoin-seeder==============Bitcoin-seeder is a crawler for the Bitcoin network, which exposes a listof reliable nodes via a built-in DNS server.Features:* regularly revisits known nodes to check their availability* bans nodes after enough failures, or bad behaviour* accepts nodes down to v0.3.19 to request new IP addresses from, but only reports good post-v0.3.24 nodes.* keeps statistics over (exponential) windows of 2 hours, 8 hours, 1 day and 1 week, to base decisions on.* very low memory (a few tens of megabytes) and cpu requirements.* crawlers run in parallel (by default 24 threads simultaneously).USAGE-----Assuming you want to run a dns seed on dnsseed.example.com, you willneed an authorative NS record in example.com's domain record, pointingto for example vps.example.com:$ dig -t NS dnsseed.example.com;; ANSWER SECTIONdnsseed.example.com. 86400 IN NS vps.example.com.On the system vps.example.com, you can now run dnsseed:./dnsseed -h dnsseed.example.com -n vps.example.comIf you want the DNS server to report SOA records, please provide ane-mailadres (with the @ part replaced by .) using -m.RUNNING AS NON-ROOT-------------------Typically, you'll need root privileges to listen to port 53 (name service).One solution is using an iptables rule (Linux only) to redirect it toa non-privileged port:$ iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353If properly configured, this will allow you to run dnsseed in userspace, usingthe -p 5353 option.