Grandstream Networks HT881

LAN Settings
Enable DDNS
Enable DDNS function.
Disabled by default
DDNS Server
Select DDNS server used, options are:
● dyndns.org
● freedns.afraid.org
● zoneedit.com
● no-ip.com
● oray.net
DDNS Username Sets the username of the DDNS server
DDNS Password Sets the password of the DDNS server
DDNS Hostname Sets the domain name of the DDNS server
DDNS Hash Sets the hash value of the DDNS server
General Settings
Working Mode of Network Interface
Refers to the conguration of the network interfaces on a device.
● NET1 is WAN and NET2 is LAN (Default): NET1 is set as the Wide Area Network (WAN) interface, typically
used to connect to the internet or external networks, while NET2 is set as the Local Area Network (LAN)
interface, used for internal local connections
● NET1 is LAN and NET2 is WAN: the roles of the interfaces are reversed, where NET1 becomes the LAN
interface, and NET2 becomes the WAN interface.
Device Mode
Controls whether the device is working in NAT Router, Bridge, or WAN Only mode.
● NAT Router: In this mode, the WAN port acts as a DHCP client. LAN port is used as DHCP Base IP; devices
connected behind the LAN port will be assigned an IP from HT841/HT881 DHCP Server.
● Bridge: In this mode, the WAN port acts as a DHCP client and pass-through to the LAN port; devices
connected behind the LAN port will get an IP from your network DHCP server (same as the WAN port).
● WAN Only: In this mode, only the WAN port is active. LAN port is not used.List Item 3
The default mode is Bridge mode.
Save the setting and reboot prior to conguring the HT841/HT881.
Enable UPnP support
When set to Yes, the HT841/HT881 acts as a UPnP gateway for your UPnP-enabled applications. UPnP =
Universal Plug and Play. The default is No.
Uplink bandwidth
Species the maximum uplink bandwidth permitted by the device.
This function is disabled by default.
The total bandwidth can be set as 128K, 256K, 512K, 1M, 2M, 3M, 4M, 5M, 10M, or 15 M.
The primary function of this setting is to limit the uplink bandwidth for the device's internal system, signaling,
and NATed trac.
Example: When 512k is congured, there will be at least 512kbps limited for internal system, signaling, and
NATed trac.
Note:Voice or RTP stream will never be limited.
Downlink bandwidth Species the maximum downlink bandwidth permitted by the device.
This function is disabled by default.
The total bandwidth can be set as 128K, 256K, 512K, 1M, 2M, 3M, 4M, 5M, 10M, or 15 M.
The primary function of this setting is to limit the download bandwidth for the device's internal system,
signaling, and NATed trac.