The following table describes the IP parameter options. Default values work well unless application tuning is required.
| Attribute | Default | Type | Description |
|---|---|---|---|
| ip_forward | 0 | Integer | Set to 1 for enabling ability to forward IP packets across network interfaces. If running lwIP on a single network interface, set to 0. This attribute can have two values: 0 or 1. |
| ip_options | 0 | Integer | When set to 1, IP options are allowed (but not parsed). When set to 0, all packets with IP options are dropped. This attribute can have two values: 0 or 1. |
| ip_reassembly | 1 | Integer | Reassemble incoming fragmented IP packets. |
| ip_frag | 1 | Integer | Fragment outgoing IP packets if their size exceeds MTU. |
| ip_reass_max_pbufs | 128 | Integer | Reassembly pbuf queue length. |
| ip_frag_max_mtu | 1500 | Integer | Assumed max MTU on any interface for IP fragmented buffer. |
| ip_default_ttl | 255 | Integer | Global default TTL used by transport layers. |