End-of-Life (EoL)
Network > Interfaces > Loopback
Use the following fields to configure a loopback interface:
Loopback Interface Settings | Configure In | Description |
---|---|---|
Interface Name | Loopback Interface | The read-only Interface Name is
set to loopback . In the adjacent field, enter a numeric suffix
(1-9999) to identify the interface. |
Comment | Enter an optional description for the interface. | |
Netflow Profile | If you want to export unidirectional IP
traffic that traverses an ingress interface to a NetFlow server,
select the server profile or click Netflow Profile to
define a new profile (see Device
> Server Profiles > NetFlow). Select None to remove
the current NetFlow server assignment from the interface. | |
Virtual Router | Loopback Interface Config | Assign a virtual router to the interface,
or click Virtual Router to define a new one
(see Network
> Virtual Routers). Select None to
remove the current virtual router assignment from the interface. |
Virtual System | If the firewall supports multiple virtual
systems and that capability is enabled, select a virtual system
(vsys) for the interface or click Virtual System to
define a new vsys. | |
Security Zone | Select a security zone for the interface,
or click Zone to define a new zone. Select None to
remove the current zone assignment from the interface. | |
Management Profile | Tunnel Interface Advanced Other Info | Management Profile —Select
a profile that defines the protocols (for example, SSH, Telnet,
and HTTP) you can use to manage the firewall over this interface.
Select None to remove the current profile
assignment from the interface. |
MTU | Enter the maximum transmission unit (MTU)
in bytes for packets sent on this interface (576-9,192; default
is 1,500). If machines on either side of the firewall perform Path
MTU Discovery (PMTUD) and the interface receives a packet exceeding
the MTU, the firewall returns an ICMP fragmentation needed message
to the source indicating the packet is too large. | |
Adjust TCP MSS | Select to adjust the maximum segment size
(MSS) to accommodate bytes for any headers within the interface MTU
byte size. The MTU byte size minus the MSS Adjustment Size equals
the MSS byte size, which varies by IP protocol:
Use these settings to address
the case where a tunnel through the network
requires a smaller MSS. If a packet has more bytes than the MSS
without fragmentation, this setting enables the adjustment.Encapsulation
adds length to headers, so it helps to configure the MSS adjustment
size to allow bytes for such things as an MPLS header or tunneled
traffic that has a VLAN tag. | |
For an IPv4 address | ||
IP | Loopback Interface IPv4 | Click Add , then perform
one of the following steps to specify a static IP address and network
mask for the interface.
You
can enter multiple IP addresses for the interface. The forwarding
information base (FIB) your system uses determines the maximum number
of IP addresses. To delete an IP address, select the address
and click Delete . |
For an IPv6 address | ||
Enable IPv6 on the interface | Loopback Interface IPv6 | Select to enable IPv6 addressing on this
interface. |
Interface ID | Enter the 64-bit extended unique identifier
(EUI-64) in hexadecimal format (for example, 00:26:08:FF:FE:DE:4E:29). If
you leave this field blank, the firewall uses the EUI-64 generated
from the MAC address of the physical interface. If you enable the Use
interface ID as host portion option when adding an address,
the firewall uses the interface ID as the host portion of that address. | |
Address | Click Add and configure
the following parameters for each IPv6 address:
|
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