Bitcoin Forum

Thanks

Bitcoin Cash uses a client called "Bitcoin ABC", so you need to google "Bitcoin ABC port number" or whatever. I wouldn't be surprised if the ports are exactly the same. They didn't even bother changing the address format which confused a lot of newbies, so I don't see why they would bother trying to get their own port number set up.

By looking at this:

https://bitnodes.earn.com/nodes/?q=Bitcoin%20ABC:0.16.1

I see ports 8333 and 8334 are used, whatever that means.

Bitcoin-ABC uses the same ports and the same data directory as Bitcoin Core.  On Windows, it also uses the same registry entries.  This causes problems if you want to run both programs on the same system.  I run both on the same Ubuntu VPS by changing the port numbers and the data directory for Bitcoin-ABC (it is easiest to use shell scripts so you don't forget to override the data directory when entering commands manually)

1 So if these two wallet connected there will be a problem？the one with longer Blockchain will kickoff the shorter one
2 you change the port?how can the wallet communicate if you change the port

No. There are a key number of differences between Bitcoin Cash and Bitcoin. First of all, there are apparent block size change which Bitcoin does not have. Per the reference nodes, these are invalid and Bitcoin Core will reject any blocks with a block weight of 4MB.

However, since Bitcoin Cash doesn't have Segwit, each byte of the normal transaction will count as 4 byte in the block weight.

Secondly, with the different Sighash, those transactions generated on the Bitcoin Cash client will not be valid on the Bitcoin network and any blocks with those transactions are also rejected.

Hence, Bitcoin Core will not consider the other Blockchain as valid, even if it has a longer proof of work.
You can. Both clients have a list of nodes which they can connect to first. You don't need to portforward the clients to get connections(outgoing) since you're connecting to others.

Thanks
If I want to change the bitcoin name. Whether I can only change the port number to keep the other stuff and use the same genesis block.  Or maybe I can also change the number of coins generated in each block to create a new coin based on bitcoin ？and it will be independent from bitcoin?

So-called “Bitcoin Cash” is a rip-off which changes just enough to cause trouble, while keeping just enough the same so as to cause more trouble.  You should not look to it for guidance; if you’re making an altcoin, change the port number (among many other things) as I told you (https://bitcointalk.org/index.php?topic=2639949.msg26875977#msg26875977) in one of the many other threads you’ve started.  You don’t want to be a rip-off, right?

P.S., myapple, please keep your closely related questions on the same subject matter within one topic, rather than spreading many redundant topics with minor variations of the same questions.

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I think that’s hilarious, in the sense that people who run that junk deserve any mischief it may cause them.  So, not only will it make users lose money due to the identical address format:  It will also clobber your Bitcoin installation?  I am asking.  I wouldn’t know.