Topic: GetMyExternalIP() why, and what happens if down ? (Read 1729 times)
Very little happens at all if it doesn't work. It's only used for hosts which are behind nat, which don't use UPNP to learn their address, and which don't have a manually configured address. These addresses are only used for announcing to other peers what addresses they can connect to.
See https://github.com/bitcoin/bitcoin/pull/3461 and https://github.com/bitcoin/bitcoin/pull/3088 for work on changing this.
I see that GetMyExternalIp() is hard coded to query www.showmyip.com and checkip.dyndns.org to get the IP of the bitcoin node.
Now there is two things I don't understand :
Why doing that ?
A recieving Bitcoin node could easily use the IP packet to get the IP of the sender, instead of that, it seems to rely on the addr_from of the Version message payload.
And what happens if both showmyip and checkip dyndns are down ? (At my home showmyip does not work)
Does most of the miners will be unable to communicate leading to a bitcoin apocalypse ?
Second, out of topic, how can I remove this ******* time limit that say I can't post on this forum because I already did it just before altough it is not true.
Now there is two things I don't understand :
Why doing that ?
A recieving Bitcoin node could easily use the IP packet to get the IP of the sender, instead of that, it seems to rely on the addr_from of the Version message payload.
And what happens if both showmyip and checkip dyndns are down ? (At my home showmyip does not work)
Does most of the miners will be unable to communicate leading to a bitcoin apocalypse ?
Second, out of topic, how can I remove this ******* time limit that say I can't post on this forum because I already did it just before altough it is not true.
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