Frequently Asked Questions

Getting Started

Default IP Address

The default IP address is 192.168.2.66 with a subnet mask of 255.255.255.0

Default administrator login

The default username is admin and the default password is admin01

General

Resetting to defaults via Ping

Devices that are missing reset to factory defaults settings button (or due to housing button is not accessible without disassembling the housing first) need functionality that allows easily reseting device to default settings.

During startup of a device, when drivers of ethernet interfaces are loaded, the discovery daemon is started. The daemon suspends startup process for 3 seconds and waits for ICMP "echo request" packet of length 369 bytes. If the packet received, the discoveryd resets the device to default configuration.

It is recommended to use a simple switch (without routing) because Windows loses connection with device during the device reboot.

Steps to reset to default settings:

Step 1. Power off the device.

Step 2. Obtain the device MAC address.

Step 3. Connect a PC to the same physical subnet as the device.

Step 4. Execute 'arp -s' command to assign the IP address (IP address should be from the same subnet as PC) to the device MAC address:

arp -s <IP address to assign> <device MAC address>

Step 5. Start pinging the device:

for linux users:

ping <IP address> -s 369

for windows users:

ping <IP address> -l 369 -t -w 200

Step 6. Power up device and wait about 30sec or more (depends from device hardware).

Step 7. Stop pinging the device, and let the device boot as usual. Device should come back with defaults settings.

Uploading firmware Via SSH

To upload firmware via SSH, please see wiki article: http://ligowave.com/wiki/index.php/How_To_Update_Firmware_via_SSH

Hardware

Antenna Connector Layouts

Connector diagrams for multiple radio devices:

LigoAP Duo

LigoAP Quad

LigoMesh Duo

LigoMesh Quad

Wireless

Recommended ACK Timeout Setting

802.11 radios have an ACK Timeout setting (acknowledgement timeout) where if the transmitting radio doesn’t get a response from the receiving radio within a certain timeframe it will assume the packets have been lost and retransmit the packets. If you have long range links, the time to send a message and then get a response back will increase and may exceed the standard ACK timeout settings. On long-range links, increasing this setting will reduce retransmits and improve the quality of the link. However, at the same time, if you have short links and your ACK settings are too high, if a packet gets lost in transit, the sender will wait longer to retransmit than usual which will degrade the link unnecessarily.

The formula to determine a baseline ACK setting is: ACK = 23 + (Distance in meters / 150)

This is just a guideline, and adjustments may need to be made depending on environment.

ACK Timeout Lookup Table

Miles	Kilometers	ACK Setting
1	1.6	34
2	3.2	44
3	4.8	55
4	6.4	66
5	8	77
6	9.7	87
7	11.3	98
8	12.9	109
9	14.5	120
10	16.1	130
11	17.7	141
12	19.3	152
13	20.9	162
14	22.5	173
15	24.1	184
16	25.7	195
17	27.4	205
18	29.0	216
19	30.6	227
20	32.2	238
21	33.8	248
22	35.4	259
23	37.0	270
24	38.6	280
25	40.2	291
26	41.8	302
27	43.5	313
28	45.1	323
29	46.7	334
30	48.3	345

RSSI Values Explained

For an explanation on RSSI Values and what to look for, see our WIKI entry:

http://ligowave.com/wiki/index.php/Understanding_RSSI_Values