Dahua HCVR21**HS-S2 Series, User Manual

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HDCVI Series DVR User
’s Manual
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may pop up dialog box for you to confirm setup when you want to change MTU setup. C lick OK
button to confirm current reboot, or you can click Cancel button to terminate current modification.
Before the modification, you can check the MTU of the gateway; the MTU of the DVR shall be the
same as or is lower than the MTU of the gateway. In this way, you can reduce packets and enhance
network transmission efficiency.
The following MTU value is for reference only.

1500: Ethernet information packet max value and it is also the default value. It is the typical
setup when there is no PPPoE or VPN. It is the default setup of some router, switch or the
network adapter.

1492: Recommend value for PPPoE.

1468: Recommend value for DHCP.

Preferred DNS server: DNS server IP address.

Alternate DNS server: DNS server alternate address.

Transfer mode: Here you can select the priority between fluency/video qualities.

LAN download: System can process the downloaded data first if you enable this function. The
download speed is 1.5X or 2.0X of the normal speed.

LAN download: System can process the downloaded data first if you enable this function. The
download speed is 1.5X or 2.0X of the normal speed.
After completing all the setups please click save button, system goes back to the previous menu.
Figure 4-83
4.11.2.2 Connection
The connection setup interface is shown as in Figure 4-84.

Max connection: system support maximal 128 users. 0 means there is no connection limit.

TCP port: Default value is 37777.

UDP port: Default value is 37778.

HTTP port: Default value is 80.

HTTPS port: Default value is 443.

RTSP port: Default value is 554.