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# Algorand Specifications

| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `MaxConnectionsPerIP` | `8` | 3 (default was `30`) | 35 |

**Description:**

Defines the maximum number of connections allowed per `IP` address.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `IncomingConnectionsLimit` | `2400` | 0 (default was `-1`) | 27 |

**Description:**

A non-negative number that specifies the maximum incoming connections for the gossip protocol configured in `NetAddress`. A value of `0` means no connections allowed.

> Estimating 1.5 MB per incoming connection.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `P2PHybridIncomingConnectionsLimit` | `1200` | 34 | 34 |

**Description:**

Used as `IncomingConnectionsLimit` for P2P connections in [Hybrid Network](https://specs.algorand.co/network/non-normative/network-nn-definitions-hybrid). For pure [P2P Network](https://specs.algorand.co/network/non-normative/network-nn-definitions-p2p) the field `IncomingConnectionsLimit` is used instead.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `BroadcastConnectionsLimit` | `-1` | 4 | 4 |

**Description:**

Defines the maximum number of peer connections that will receive broadcast (gossip) messages from this node.

Succinctly, it works in the following way:

- If a node has more connections than the specified limit, it prioritizes broadcasting to peers in the following order:
  1. Outgoing connections: Peers a node actively connects to.
  2. Peers with higher stake: Determined by the amount of ALGO held, as indicated by their [participation key](https://specs.algorand.co/keys/keys-participation#voting-and-participation-keys).
- Special values:
  - `0`: Disables all outgoing broadcast messages, including transaction broadcasts to peers.
  - `-1`: No limit on the number of connections receiving broadcasts (default setting).

> For further details, refer to the Algorand Network [non-normative specification](https://specs.algorand.co/network/network-overview).

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `AnnounceParticipationKey` | `true` | 4 | 4 |

**Description:**

Indicates if this node should announce its [participation key](https://specs.algorand.co/keys/keys-participation#voting-and-participation-keys) with the largest stake to its peers. In case of a _DoS_ attack, this allows peers to prioritize connections.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `PriorityPeers` | Empty string | 4 | 4 |

**Description:**

Specifies peer `IP` addresses that should always get outgoing broadcast messages from this node.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `ConnectionsRateLimitingCount` | `60` | 4 | 4 |

**Description:**

Used with `ConnectionsRateLimitingWindowSeconds` to determine whether a connection request should be accepted. The gossip network examines all the incoming requests in the past `ConnectionsRateLimitingWindowSeconds` seconds that share the same origin. If the total count exceeds this value, the connection is refused.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `ConnectionsRateLimitingWindowSeconds` | `1` | 4 | 4 |

**Description:**

Used with `ConnectionsRateLimitingCount` to determine whether a connection request should be accepted. Providing a zero value in this variable disables the connection _rate limiting_.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `DisableOutgoingConnectionThrottling` | `false` | 5 | 5 |

**Description:**

Disables _connection throttling_ of the network library, which allows the network library to continuously disconnect Relay Nodes based on their relative (and absolute) performance.

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| Parameter Name | Default Value | Introduced in Version | Last Updated in Version |
| --- | --- | --- | --- |
| `DisableLocalhostConnectionRateLimit` | `true` | 16 | 16 |

**Description:**

Controls whether the incoming _connection rate limit_ applies to connections originating from the local machine. Setting this to `true` allows this node to create a large local-machine network that won’t trip the incoming connection limit observed by Relay Nodes.

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