networkseed
===========

Networkseed is a crawler for the Siriuscoin network, which exposes a list of 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 network seed on seed.example.com, you will need an authorative NS record in example.com's domain record, pointing to for example vps.example.com:

$ dig -t NS seed.example.com

;; ANSWER SECTION
seed.example.com.   86400    IN      NS     vps.example.com.

On the system vps.example.com, you can now run networkseed:

./networkseed -h seed.example.com -n vps.example.com

If you want the DNS server to report SOA records, please provide an e-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 to a non-privileged port:

$ iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353

If properly configured, this will allow you to run networkseed in userspace, using the -p 5353 option.