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When Bitcoin Core starts, it establishes 8 outbound connections to other full nodes so it can download the latest blocks and transactions. You can use the testing instructions below to confirm your server-based node accepts inbound connections.
Home connections are usually filtered by a router or modem. You may also need to configure your firewall to allow inbound connections to port Please see the following subsections for details. The BitNodes project provides an online tool to let you test whether your node accepts inbound connections.
Before using BitNodes, you must first ensure that your node is fully synced with the block chain. The tool will attempt to guess your IP address—if the address is wrong or blank , you will need to enter your address manually. After you press Check Node, the tool will inform you whether your port is open green box or not open red box. If you get the red box, please read the enabling connections subsection.
For confirmation that you accept inbound connections, you can use Bitcoin Core. If your node has been online for at least 30 minutes, it should normally have inbound connections. If want to check your peer info using Bitcoin Core, choose the appropriate instructions below:.
If you hover over the signal strength icon, it will tell you how many connections you have. For confirmation, you can go to the Help menu, choose Debug Window, and open the Information tab.
In the Network section, it will tell you exactly how many inbound connections you have. If the number is greater than zero, then inbound connections are allowed. The getconnectioncount command will tell you how many connections you have. If you have more than 8 connections, inbound connections are allowed. For example:. For confirmation, you can use the getpeerinfo command to get information about all of your peers.
If you have any inbound connections, then inbound connections are allowed. Forwarding inbound connections from the Internet through your router to your computer where Bitcoin Core can process them. Configuring your firewall to allow inbound connections. However, routers usually give computers dynamic IP addresses that change frequently, so we need to ensure your router always gives your computer the same internal IP address.
Most routers can be configured using one of the following URLs, so keep clicking links until you find one that works. Upon connecting, you will probably be prompted for a username and password. If you configured a password, enter it now. If not, the Router Passwords site provides a database of known default username and password pairs. These options may also be called Address Reservation.
In the reservation configuration, some routers will display a list of computers and devices currently connected to your network, and then let you select a device to make its current IP address permanent:. Other routers require a more manual configuration. This operation differs by operating system:. Type cmd to open the console. Replace all the dashes with colons, so the address looks like this: AB.
Use that address in the instructions below. Linux: open a terminal and type ifconfig. Find the result that best matches your connection—a result starting with wlan indicates a wireless connection.
Find the field that starts with HWaddr and copy the immediately following field that looks like ab. Use that value in the instructions below. Mac OS X: open a terminal and type ifconfig. Find the result that best matches your connection—a result starting with en1 usually indicates a wireless connection. Find the field that starts with ether: and copy the immediately following field that looks like ab. Also choose an IP address and make a note of it for the instructions in the next subsection.
After entering this information, click the Add or Save button. Then reboot your computer to ensure it gets assigned the address you selected and proceed to the Port Forwarding instructions below. For this step, you need to know the local IP address of the computer running Bitcoin Core.
You should have this information from configuring the DHCP assignment table in the subsection above. Login to your router using the same steps described near the top of the DHCP subsection. Both the external port and the internal port should be for Bitcoin. Make sure the IP address you enter is the same one you configured in the previous subsection. After filling in the details for the mapping, save the entry.
You should not need to restart anything. See the Firewall section below. Firewalls block inbound connections. This is usually as easy as starting your firewall configuration software and defining a new rule to allow inbound connections to port For additional information for Windows, see the links below:.
Mac OS X comes with its firewall disabled by default, but if you have enabled it, see the section Allowing Specific Applications from the official Apple guide. Ubuntu also comes with its firewall disabled by default, but if you have enabled it, see the Ubuntu wiki page for information about adding port forwarding rules.
This section contains advice about how to change your Bitcoin Core configuration to adapt it to your needs. There are two ways to change your configuration. The first is to start Bitcoin Core with the options you want.
For example, if you want to limit it to using one CPU core for signature verification, you can start Bitcoin Core like this:. You can find that file in the following directories:. To add an option to the configuration file, just remove its leading dash. You may also need to remove any quotation marks you used in your shell.
For example, the -par option seen above would look like this in the configuration file:. A user-friendly configuration file generator is available here. If you have any questions about configuring Bitcoin Core, please stop by one of our forums or live chatrooms. It is possible to configure your node to to run in pruned mode in order to reduce storage requirements.
This can reduce the disk usage from over GB to around 5GB. Running a node in pruned mode is incompatible with -txindex and -rescan. It also disables the RPC importwallet. Two RPCs that are available and potentially helpful, however, are importprunedfunds and removeprunedfunds. A value of 0 disables pruning. The minimal value above 0 is To mitigate this risk, you need to have access to your counterparty's reputation and trade history.
This is precisely the kind of information that the OTC web of trust provides. Disclaimers bitcoin-otc is merely an aggregator of outstanding supply and demand. Feel free to grab it from this github git repository. Improvements and contributions are welcome.
If you would like to post questions or bug reports, please use the issues tracker on github for this repository.