Symantec 360R Administration Guide - Page 45

Maximum Transmission Unit (MTU), Configuring dynamic DNS - 360 restore

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Configuring a connection to the outside network 45 Configuring dynamic DNS Warning: To reset the echo request settings, click Restore Defaults. This also resets the MTU number and the DHCP Idle Renew settings to their default values. Maximum Transmission Unit (MTU) You can specify the maximum size of the packets that arrive at and leave the appliance through the WAN port you are configuring. This is useful if a computer or another appliance along the transmission path requires a smaller MTU. On models 360 and 360R, if you are configuring WAN1 and WAN2, you can set a different MTU for each port. To specify MTU size See "Advanced tab field descriptions" on page 175. 1 In the SGMI, in the left pane, click WAN/ISP. 2 In the right pane, on the Advanced tab, under Optional Connection Settings, in the WAN port text box, type the MTU size. 3 Click Save. Warning: To reset the MTU size, click Restore Defaults. This also resets the echo request information and the DHCP Idle Renew settings to their default values. Configuring dynamic DNS The Symantec Gateway Security 300 Series can use a dynamic DNS service to map dynamic IP addresses to a domain name to which users can connect. If you receive your IP address dynamically from your ISP, dynamic DNS services let you use your own domain name (mysite.com, for example) or to use their domain name and your subdomain to connect to your services, such as a a VPN gateway, Web site or FTP. For example, if you set up a virtual Web server and your ISP assigns you a different IP address each time you connect the server, your users can always access www.mysite.com. The appliances support two types of dynamic DNS services: standard and TZO. You can configure either service by specifying account information, or you can disable dynamic DNS completely. See the Symantec Gateway Security 300 Series Release Notes for the list of supported services.

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45
Configuring a connection to the outside network
Configuring dynamic DNS
Warning:
To reset the echo request settings, click Restore Defaults. This also
resets the MTU number and the DHCP Idle Renew settings to their default
values.
Maximum Transmission Unit (MTU)
You can specify the maximum size of the packets that arrive at and leave the
appliance through the WAN port you are configuring. This is useful if a
computer or another appliance along the transmission path requires a smaller
MTU. On models 360 and 360R, if you are configuring WAN1 and WAN2, you
can set a different MTU for each port.
To specify MTU size
See
“Advanced tab field descriptions”
on page 175.
1
In the SGMI, in the left pane, click
WAN/ISP
.
2
In the right pane, on the Advanced tab, under Optional Connection Settings,
in the WAN port text box, type the MTU size.
3
Click
Save
.
Warning:
To reset the MTU size, click Restore Defaults. This also resets the echo
request information and the DHCP Idle Renew settings to their default values.
Configuring dynamic DNS
The Symantec Gateway Security 300 Series can use a dynamic DNS service to
map dynamic IP addresses to a domain name to which users can connect.
If you receive your IP address dynamically from your ISP, dynamic DNS services
let you use your own domain name (mysite.com, for example) or to use their
domain name and your subdomain to connect to your services, such as a a VPN
gateway, Web site or FTP. For example, if you set up a virtual Web server and
your ISP assigns you a different IP address each time you connect the server,
your users can always access www.mysite.com.
The appliances support two types of dynamic DNS services: standard and TZO.
You can configure either service by specifying account information, or you can
disable dynamic DNS completely.
See the
Symantec Gateway Security 300 Series Release Notes
for the list of
supported services.