---
title: "Promicious mode"
url: "https://maker.wiznet.io/forum/9914"
markdown_url: "https://maker.wiznet.io/forum/9914/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "Think01"
created: "2014-02-10T10:15:58+09:00"
last_activity: "2017-05-04T08:31:18+09:00"
language: "en"
views: 2050
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Promicious mode

## Question

Asked by Think01 on 2014-02-10 in Ethernet Chips.

does it support promicious mode for use in network traffic monitoring device?

## Replies

### Reply 1 by suhwan, 2014-02-10

Hi Think01,

W5500 support MACRAW mode.
Raw packets can be sniff in this mode.

Refer to MACRAW mode in datasheet and reference code as below,

Driver Ethernet (Berkeley Socket type APIs) 1.0.2 :
[url][http://wizwiki.net/wiki/doku.php?id=products:w5500:driver\[/url\]](http://wizwiki.net/wiki/doku.php?id=products:w5500:driver%5B/url%5D)

In MACRAW mode, socket / sendto / recvfrom / close function are used.

- Socket number ‘0’ can be only open in MACRAW mode.
  socket(0, Sn_MR_MACRAW, dummyport, 0)
  sendto(0, buf, len, dummpyip, dummpyport)
  recvfrom(0, buf, len, dummpyip, dummpyport)
  close(0)

Thanks,

---

Source: https://maker.wiznet.io/forum/9914