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p2p: add 0 port check in dialer (#21008)
* p2p: add low port check in dialer We already have a check like this for UDP ports, add a similar one in the dialer. This prevents dials to port zero and it's also an extra layer of protection against spamming HTTP servers. * p2p/discover: use errLowPort in v4 code * p2p: change port check * p2p: add comment * p2p/simulations/adapters: ensure assigned port is in all node records
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