# Netgear Switch Discovery Protocol

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**Netgear Switch Discovery Protocol** (**NSDP**) is a management protocol for several network device families, designed by [Netgear](/source/Netgear).

## Message structure

### Common message header

Offset Length Meaning 0x0000 1 Proto version – always 0x01 0x0001 1 Operation code: may be 0x01 – read request, 0x02 – read response, 0x03 – write request, 0x04 – write response 0x0002 2 Operation result 0x0004 4 Unknown 0x0008 6 host MAC-address 0x000e 6 network device MAC-address (value 00:00:00:00:00:00 is used as multicast address, request will be proceeded by all devices, which would receive it) 0x0014 2 Unknown 0x0016 2 Sequence number (value increments with every next request) 0x0018 4 Protocol signature NSDP 0x001С 4 Unknown 0x0020 N Message body – the sequence of TLV records 0x0020 + N 4 End of message marker 0xFFFF0000

### Message body record structure

Message body records are [type–length–value](/source/Type%E2%80%93length%E2%80%93value) (TLV) structures. Type field may be one of following values in the table(list in incomplete):

Type Meaning 0x0001 Device model 0x0003 Device given name 0x0004 Device MAC-address 0x0005 Device system location 0x0006 Device current IP-address (may be unsupported by certain devices) 0x0007 Device IP-network mask (may be unsupported by certain devices) 0x0008 Router IP-address (may be unsupported by certain devices) 0x000a administration password 0x000b DHCP Mode (Refresh DHCP = 2, DHCP = 1, Static = 0) 0x000d Device Firmware version slot 1 (may be unsupported by certain devices) 0x000e Device Firmware version slot 2 (may be unsupported by certain devices) 0x000f Next active firmware slot after reboot (01 = 1, 02 = 2, may be unsupported by certain devices) 0x0c00 Speed/link status of ports 0x1000 Port Traffic Statistic 0x2800 Get VLAN info 0x2c00 Delete VLAN (write only)

## Protocol flow examples

Network devices discovery ([MAC](/source/MAC_address)-address an device model discovery): **Host with MAC=XX:XX:XX:XX:XX:XX from [UDP](/source/User_Datagram_Protocol)-port 63321 or 63323 sending packet to broadcast [IP](/source/IP_address)-address 255.255.255.255 and UDP-port 63322 or 63324** Header @0x00000000 0x01 0x01 0x000000000000 0xXXXXXXXXXXXX 0x000000000000 0x0000 0x0001 0x4E534450 0x00000000 Body @0x00000020 0x0001 0x0000 0x0004 0x0000 Marker @0x00000028 0xFFFF0000

**EACH Device responds with message like** Header @0x00000000 0x01 0x02 0x000000000000 0xXXXXXXXXXXXX 0xYYYYYYYYYYYY 0x0000 0x0001 0x4E534450 0x00000000 Body @0x00000020 0x0001 0x0028 0x47 0x53 0x31 0x30 0x35 0x45 0x20*0x22 0x0004 0x0006 0xYYYYYYYYYYYY Marker @0x00000058 0xFFFF0000

## Device support for protocol

- GS105E ProSAFE Plus
- GS108E ProSAFE Plus
- GS724T
- GS748T
- FS116E (IP-network description and Firmware version TLVs are not supported)
- FS726TP (uses 63323 and 63324 UDP-ports for interconnection)

## Devices firmware update

Device [firmware update](/source/Patch_(computing)) is made with [TFTP](/source/TFTP) protocol, but you need to send NSDP request to turn on [TFTP](/source/TFTP)-server first.

## See also

- [IP](/source/IP_address)
- [UDP](/source/User_Datagram_Protocol)
- [MAC](/source/MAC_address)
- [Netgear](/source/Netgear)

## External links

- [NETGEAR official site](http://www.netgear.com/)
- [openSource Perl-written cross-platform toolkit for NSDP managed devices project site (in russian)](http://www.vishnivetsky.ru/%D0%B7%D0%B0%D0%BC%D0%B5%D1%82%D0%BA%D0%B8%20%D1%81%D1%82%D0%B0%D1%82%D1%8C%D0%B8%20%D0%BE%D0%B1%D0%B7%D0%BE%D1%80%D1%8B/NETGEAR%20Prosafe%20Plus%20configuration%20linux.html) [Archived](https://web.archive.org/web/20161220060040/http://www.vishnivetsky.ru/%D0%B7%D0%B0%D0%BC%D0%B5%D1%82%D0%BA%D0%B8%20%D1%81%D1%82%D0%B0%D1%82%D1%8C%D0%B8%20%D0%BE%D0%B1%D0%B7%D0%BE%D1%80%D1%8B/NETGEAR%20Prosafe%20Plus%20configuration%20linux.html) 2016-12-20 at the Wayback Machine
- [LinNetx openSource C-written utility for ProsafePlus switches management via NSDP, not operational](https://sourceforge.net/projects/linnetx/)
- [ngadmin](http://www.netgeek.ovh/wiki/projets:ngadmin) *C-written admin utility; GPLv2 license*
- [ProSafeLinux](https://github.com/tabacha/ProSafeLinux) *Remark: sparse information; FreeBSD license*
- [NSDP Protocol Wireshark dissector](https://github.com/kvishnivetsky/wireshark-dissector-nsdp) *Remark: GPL license*
- [Nsdtool](http://www.curesec.com/en/publications/tools.html) – a toolset of scripts to detect NETGEAR switches in local networks
- [NETGEAR firmware update](https://routerfirmwareupdates.com/netgear-firmware-update/)

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Adapted from the Wikipedia article [Netgear Switch Discovery Protocol](https://en.wikipedia.org/wiki/Netgear_Switch_Discovery_Protocol) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Netgear_Switch_Discovery_Protocol?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.