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# Algorand Specifications

| Parameter Name                         | Default Value | Introduced in Version | Last Updated in Version |
| -------------------------------------- | ------------- | --------------------- | ----------------------- |
| `IncomingMessageFilterBucketCount`    | `5`          | 0                     | 0                       |

**Description:**

Specifies the number of hash buckets used to filter and manage incoming messages.
When a [message is received](https://specs.algorand.co/network/network-overview), the node computes
its hash. The hash is then assigned to one of the available buckets based on its
value. Each bucket holds a set of message hashes, allowing the node to quickly check
if it has already processed a message and filter out duplicates.

* * *

| Parameter Name                        | Default Value | Introduced in Version | Last Updated in Version |
| ------------------------------------- | ------------- | --------------------- | ----------------------- |
| `IncomingMessageFilterBucketSize`    | `512`        | 0                     | 0                       |

**Description:**

Defines the size of each incoming message hash bucket.

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| Parameter Name                        | Default Value | Introduced in Version | Last Updated in Version |
| ------------------------------------- | ------------- | --------------------- | ----------------------- |
| `OutgoingMessageFilterBucketCount`    | `3`          | 0                     | 0                       |

**Description:**

Defines the number of outgoing message hash buckets.

* * *

| Parameter Name                        | Default Value | Introduced in Version | Last Updated in Version |
| ------------------------------------- | ------------- | --------------------- | ----------------------- |
| `OutgoingMessageFilterBucketSize`    | `128`        | 0                     | 0                       |

**Description:**

Defines the size of each outgoing message hash bucket.

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| Parameter Name                                       | Default Value | Introduced in Version | Last Updated in Version |
| ---------------------------------------------------- | ------------- | --------------------- | ----------------------- |
| `EnableOutgoingNetworkMessageFiltering`              | `true`       | 0                     | 0                       |

**Description:**

Enables the filtering of outgoing messages by comparing their hashes with those
in the message hash buckets.

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| Parameter Name                            | Default Value | Introduced in Version | Last Updated in Version |
| ----------------------------------------- | ------------- | --------------------- | ----------------------- |
| `EnableIncomingMessageFilter`            | `false`      | 0                     | 0                       |

**Description:**

Enables the filtering of incoming messages.

* * *

| Parameter Name                            | Default Value | Introduced in Version | Last Updated in Version |
| ----------------------------------------- | ------------- | --------------------- | ----------------------- |
| `TxIncomingFilteringFlags`               | `1`          | 26                    | 26                      |

**Description:**

Instructs [`algod`](https://specs.algorand.co/node/non-normative/node-nn-algod) filtering of incoming transaction
messages.

Flag values:

- `0x00`: Disabled.
- `0x01` (`txFilterRawMsg`): Check for raw transaction message duplicates.
- `0x02` (`txFilterCanonical`): Check for canonical transaction group duplicates.

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| Parameter Name                            | Default Value | Introduced in Version | Last Updated in Version |
| ----------------------------------------- | ------------- | --------------------- | ----------------------- |
| `TxIncomingFilterMaxSize`               | `500000`     | 28                    | 28                      |

**Description:**

Sets the maximum size for the de-duplication cache used by the incoming transaction
filter. Only relevant if `TxIncomingFilteringFlags` is non-zero.

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