# Construct private Tangle with Goshimmer

## Node-A

### Clone
- ```$ git clone https://github.com/iotaledger/goshimmer```
- ```$ cd goshimmer```

### Remove default entryNode

diff --git a/plugins/autopeering/parameters/parameters.go b/plugins/autopeering/parameters/parameters.go
index 8332389..e277aba 100644
--- a/plugins/autopeering/parameters/parameters.go
+++ b/plugins/autopeering/parameters/parameters.go
@@ -4,7 +4,7 @@ import "github.com/iotaledger/goshimmer/packages/parameter"

 var (  
        ADDRESS         = parameter.AddString("AUTOPEERING/ADDRESS", "0.0.0.0", "address to bind for incoming peering requests")
-       ENTRY_NODES     = parameter.AddString("AUTOPEERING/ENTRY_NODES", "7f7a876a4236091257e650da8dcf195fbe3cb625@159.69.158.51:14626", "list of trusted entry nodes for auto peering")
+       ENTRY_NODES     = parameter.AddString("AUTOPEERING/ENTRY_NODES", "", "list of trusted entry nodes for auto peering")
        PORT            = parameter.AddInt("AUTOPEERING/PORT", 14626, "tcp port for incoming peering requests")
        ACCEPT_REQUESTS = parameter.AddBool("AUTOPEERING/ACCEPT_REQUESTS", true, "accept incoming autopeering requests")
        SEND_REQUESTS   = parameter.AddBool("AUTOPEERING/SEND_REQUESTS", true, "send autopeering requests")

### Build
- Remember change default API port before building

$ go build -o shimmer-a

### Run Node-A
- Run

$ ./shimmer-a -autopeering-port 14267 -gossip-port 14667

- Ports

$ sudo netstat -ntlp | grep shimmer-a

tcp        0      0 0.0.0.0:14267           0.0.0.0:*               LISTEN      26580/./shimmer-a   
tcp        0      0 0.0.0.0:14667           0.0.0.0:*               LISTEN      26580/./shimmer-a   
tcp6       0      0 :::8083                 :::*                    LISTEN      26580/./shimmer-a    

### Get ID of Node-A
- Node ID: ca57ef63e9872ba9751b379147a66d8023375c05

## Node-B

### Clone
- ```$ git clone https://github.com/iotaledger/goshimmer```
- ```$ cd goshimmer```
- Remove entryNode
- Build
- Remember change default API port before building
- Run with entryNode(Node-A)

./shimmer-b -autopeering-port 14268 -gossip-port 14668 -autopeering-entry-nodes "ca57ef63e9872ba9751b379147a66d8023375c05@127.0.0.1:14627"

- Restart Node-A with entryNode(Node-B)

./shimmer-a -autopeering-port 14267 -gossip-port 14667 -autopeering-entry-nodes "782e154464fd90ad2dedb7c53557c3d62bc9793c:127.0.0.1:14268" -node-enable-plugins "spammer"

## SPAM on goshimmer private-Tangle testing
We remove the default entryNode on each goshimmer node(Node-A and Node-B) and add with entryNode to each other, finally issue the SPAM transaction from Node-A and see if Node-B get SPAM transactions.

### Node-A: Replace IF entryNode with Node-B ID

### Node-B: Replace IF entryNode with Node-A ID

### SPAM from Node-A
- Request
http://node0.puyuma.org:8083/spammer?cmd=start&tps=10000
- Response
{"duration":6,"status":"success","message":"started spamming transactions"}

- Node-A status screen: Got TPS
- Thu Aug 15 21:50:42 CST 2019



- Node-B dashboard: Got TPS


- Note: SPAM is not really broadcast

- [source](https://github.com/iotaledger/goshimmer/blob/master/packages/transactionspammer/transactionspammer.go#L53)

tx := value_transaction.New()
    tx.SetHead(true)

    tx.SetTail(true)
    tx.SetValue(totalSentCounter)
    tx.SetBranchTransactionHash(tipselection.GetRandomTip())
    tx.SetTrunkTransactionHash(tipselection.GetRandomTip())

    gossip.Events.ReceiveTransaction.Trigger(tx.MetaTransaction)