Cannot get data published by other nodes

Help
1

Scenario: Two computers on different networks start IPFS respectively. Node 1 add file A, node 2 get file A. Node 2 cannot download file A.

Operation: Node 1

ipfs add F:\ipfstest\mytest.txt
11 B / 11 B [================================================================================================] 100.00%eadded QmPfmAqjeZ4Zkk24rcTET3uyFdhHjKHoYRjHy9PwHzormW mytest.txt
11 B / 11 B [================================================================================================] 100.00%
PS: execution succeed
ipfs name publish QmPfmAqjeZ4Zkk24rcTET3uyFdhHjKHoYRjHy9PwHzormW
Published to QmSBL6xWfhkrtms26iugsiyKsDHRQ77FUEUU2ATiD7fJnx: /ipfs/QmPfmAqjeZ4Zkk24rcTET3uyFdhHjKHoYRjHy9PwHzormW
PS: execution succeed

Node 2

ipfs dht findprovs QmPfmAqjeZ4Zkk24rcTET3uyFdhHjKHoYRjHy9PwHzormW
QmSBL6xWfhkrtms26iugsiyKsDHRQ77FUEUU2ATiD7fJnx
PS: execution succeed
ipfs get -o=G:\ipfstest\mytest.txt QmSBL6xWfhkrtms26iugsiyKsDHRQ77FUEUU2ATiD7fJnx
PS: execution failed
ipfs get -o=G:\ipfstest\mytest.txt QmPfmAqjeZ4Zkk24rcTET3uyFdhHjKHoYRjHy9PwHzormW
PS: execution failed
ipfs get -o=G:\ipfstest\mytest.txt /ipfs/QmPfmAqjeZ4Zkk24rcTET3uyFdhHjKHoYRjHy9PwHzormW
PS: execution failed
ipfs get -o=G:\ipfstest\mytest.txt /ipns/QmSBL6xWfhkrtms26iugsiyKsDHRQ77FUEUU2ATiD7fJnx
PS: execution failed

Problem: Can’t download data on other nodes under WAN?

2

Is QmSBL6xWfhkrtms26iugsiyKsDHRQ77FUEUU2ATiD7fJnx reachable from the outside? Can Node A open a connection to it? Is it advertising the right IP/port (ipfs id)?.

3

Does the get operation only get data from peer nodes?
It can only get data from the list of nodes displayed by the “swarm peers” command？
If it is not a peer node, is it only available through the “dht get” command?

I can’t connect using the “swarm connect” command, but I can get it using the “dht get” command

4

I can’t connect using the “swarm connect” command, but I can get it using the “dht get” command

Your peer has the data, so if you can’t connect to it from a different peer, then the gateways will not be able to connect to it either and extract the data.

5

I understand, I tested it again, and it is true that only after the port is mapped to the public network, other nodes can get data blocks through the get command.
I originally thought that I could get the block through the transit of other nodes, like this
get

6

Hello, why not consider transferring data through a gateway node?
For example: Node A can connect to node C, node B can connect to node C, node A cannot connect to node B. If node A wants to get data from node B, it can transfer through node C.
In this case, as long as you have Internet access, you can download content from any node.