Network > Interfaces > VLAN
Table of Contents
Network > Interfaces > VLAN
A VLAN interface can provide routing into a Layer 3
network (IPv4 and IPv6). You can add one or more Layer 2 Ethernet
ports (see PA-7000
Series Layer 2 Interface) to a VLAN interface.
VLAN Interface Settings | Configure In | Description |
|---|---|---|
Interface Name | VLAN Interface | The read-only Interface Name is
set to vlan. In the adjacent field, enter a numeric suffix
(1 to 9,999) 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. | |
VLAN | Select a VLAN or click VLAN to
define a new one (see Network
> VLANs). Select None to remove the
current VLAN assignment from the interface. | |
Virtual Router | 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 | 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 (range is 576 to 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. | |
IP Address MAC Address Interface | To add one or more static Address Resolution
Protocol (ARP) entries, click Add and enter
an IP address, enter its associated hardware [media access control
(MAC)] address, and select a Layer 3 interface that can access the
hardware address. To delete an entry, select the entry and click Delete.
Static ARP entries reduce ARP processing and preclude man-in-the-middle attacks
for the specified addresses. | |
IPv6 Address MAC Address | To provide neighbor information for Neighbor
Discovery Protocol (NDP), click Add and enter
the IPv6 address and MAC address of the neighbor. | |
Enable NDP Proxy | Select to enable Neighbor Discovery Protocol
(NDP) Proxy for the interface. The firewall will respond to ND packets
requesting MAC addresses for IPv6 addresses in this list. In the
ND response, the firewall sends its own MAC address for the interface,
and is basically saying, “send me the packets meant for these addresses.” (Recommended)
Enable NDP Proxy if you are using Network Prefix Translation IPv6
(NPTv6). If you Enable NDP Proxy, you
can filter numerous Address entries: first
enter a filter and then apply it (green arrow). | |
Address | Add one or more IPv6
addresses, IP ranges, IPv6 subnets, or address objects for which
the firewall will act as NDP Proxy. Ideally, one of these addresses
is the same address as that of the source translation in NPTv6.
The order of addresses does not matter. If the address is
a subnetwork, the firewall will send an ND response for all addresses
in the subnet, so we recommend you also add the firewall’s IPv6
neighbors and then click Negate to instruct
the firewall not to respond to these IP addresses. | |
Negate | Select Negate for
an address to prevent NDP proxy for that address. You can negate
a subset of the specified IP address range or IP subnet. | |
Settings | Select Settings to make the DDNS fields
available to configure. | |
Enable | Enable DDNS on the interface. You must initially
enable DDNS to configure it. (If your DDNS configuration is unfinished,
you can save it without enabling it so that you don’t lose your partial
configuration.) | |
Update Interval (days) | Enter the interval (in days) between updates
that the firewall sends to the DDNS server to update IP addresses
mapped to FQDNs (range is 1 to 30; default is 1). The
firewall also updates DDNS upon receiving a new IP address for the
interface from the DHCP server. | |
Certificate Profile | Select a Certificate Profile that
you created (or create a new one) to verify the DDNS service. The
DDNS service presents the firewall with a certificate signed by
the certificate authority (CA). | |
Hostname | Enter a hostname for the interface, which
is registered with the DDNS Server (for example, host123.domain123.com,
or host123). The firewall does not validate the hostname except
to confirm that the syntax uses valid characters allowed by DNS for
a domain name. | |
Vendor | Select the DDNS vendor (and version number)
that provides DDNS service to this interface:
If
you select an older version of a DDNS service that the firewall
indicates will be phased out by a certain date, move to the newer
version. The Name and Value fields
that follow the vendor name are vendor-specific. Some fields are
read-only to notify you of the parameters that the firewall uses
to connect to the DDNS service. Configure the other fields, such
as a password that the DDNS service provides to you and a timeout
the firewall uses if it doesn’t receive a response from the DDNS
server. | |
IPv4 tab - IP | Add the IPv4 addresses configured on the
interface and select them. All selected IP addresses are registered
with the DDNS provider (Vendor). | |
IPv6 tab - IPv6 | (cont) | Add the IPv6 addresses configured on the
interface and select them. All selected IP addresses are registered
with the DDNS provider (Vendor). |
Show Runtime Info | Displays the DDNS registration: DDNS provider,
resolved FQDN, and the mapped IP address(es) with an asterisk (*)
indicating the primary IP address. Each DDNS provider has its own
return codes to indicate the status of the hostname update, and
a return date, for troubleshooting purposes. | |
For an IPv4 address | ||
Type | Select the method for assigning an IPv4
address type to the interface:
Firewalls
that are in a high availability (HA) active/active configuration
don’t support DHCP Client. Based on your IP address
method selection, the options displayed in the tab will vary. | |
| ||
IP | 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. Delete an
IP address when you no longer need it. | |
IPv4 address Type = DHCP | ||
Enable | Select to activate the DHCP client on the
interface. | |
Automatically create default route pointing to
default gateway provided by server | Select to automatically create a default
route that points to the default gateway that the DHCP server provides. | |
Send Hostname | Select to configure the firewall (as a DHCP
client) to send the hostname of the interface (Option 12) to the
DHCP server. If you Send Hostname, then by default, the hostname
of the firewall is the choice in the hostname field. You can send
that name or enter a custom hostname (64 characters maximum including
uppercase and lowercase letters, numbers, periods, hyphens, and
underscores. | |
Default Route Metric | For the route between the firewall and DHCP
server, optionally enter a route metric (priority level) to associate
with the default route and to use for path selection (range is 1
to 65,535; there is no default). The priority level increases as
the numeric value decreases. | |
Show DHCP Client Runtime Info | Select to display all settings received
from the DHCP server, including DHCP lease status, dynamic IP address
assignment, subnet mask, gateway, and server settings (DNS, NTP,
domain, WINS, NIS, POP3, and SMTP). | |
For an IPv6 address | ||
Enable IPv6 on the interface | 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:
| |
Enable Duplication Address Detection | Select to enable duplicate address detection
(DAD), which allows you to specify the number of DAD Attempts. | |
DAD Attempts | Specify the number of DAD attempts within
the neighbor solicitation interval (NS Interval)
before the attempt to identify neighbors fails (range is 1 to 10;
default is 1). | |
Reachable Time | Specify the length of time, in seconds,
that a neighbor remains reachable after a successful query and response
(range is 1 to 36,000; default is 30). | |
NS Interval (neighbor solicitation interval) | Specify the number of seconds for DAD attempts
before failure is indicated (range is 1 to 10; default is 1). | |
Enable NDP Monitoring | Select to enable Neighbor Discovery Protocol
monitoring. When enabled, you can select the NDP ( 
| |
Enable Router Advertisement | Select to provide Neighbor Discovery on
IPv6 interfaces and configure the other fields in this section.
IPv6 DNS clients that receive the router advertisement (RA) messages
use this information. RA enables the firewall to act as a
default gateway for IPv6 hosts that are not statically configured
and to provide the host with an IPv6 prefix for address configuration.
You can use a separate DHCPv6 server in conjunction with this feature
to provide DNS and other settings to clients. This is a global
setting for the interface. If you want to set RA options for individual
IP addresses, Add an Address to
the IP address table and configure it. If you set RA options for
any IP address, you must Enable Router Advertisement for
the interface. | |
Min Interval (sec) | Specify the minimum interval, in seconds,
between RAs that the firewall will send (range is 3 to 1,350; default
is 200). The firewall will send RAs at random intervals between
the minimum and maximum values you configure. | |
Max Interval (sec) | Specify the maximum interval, in seconds,
between RAs that the firewall will send (range is 4 to 1,800; default
is 600). The firewall will send RAs at random intervals between
the minimum and maximum values you configure. | |
Hop Limit | Specify the hop limit to apply to clients
for outgoing packets (range is 1 to 255; default is 64). Enter 0 for
no hop limit. | |
Link MTU | Specify the link maximum transmission unit
(MTU) to apply to clients. Select unspecified for
no link MTU (range is 1,280 to 9,192; default is unspecified). | |
Reachable Time (ms) | Specify the reachable time, in milliseconds,
that the client will use to assume a neighbor is reachable after
receiving a reachability confirmation message. Select unspecified for
no reachable time value (range is 0 to 3,600,000; default is unspecified). | |
Retrans Time (ms) | Specify the retransmission timer that determines
how long the client will wait (in milliseconds) before retransmitting
neighbor solicitation messages. Select unspecified for
no retransmission time (range is 0 to 4,294,967,295; default is unspecified). | |
Router Lifetime (sec) | Specify how long, in seconds, the client
will use the firewall as the default gateway (range is 0 to 9,000;
default is 1,800). Zero specifies that the firewall is not the default
gateway. When the lifetime expires, the client removes the firewall
entry from its Default Router List and uses another router as the
default gateway. | |
Router Preference | If the network segment has multiple IPv6
routers, the client uses this field to select a preferred router.
Select whether the RA advertises the firewall router as having a High, Medium (default),
or Low priority relative to other routers
on the segment. | |
Managed Configuration | Select to indicate to the client that addresses
are available via DHCPv6. | |
Other Configuration | Select to indicate to the client that other
address information (for example, DNS-related settings) is available
via DHCPv6. | |
Consistency Check | Select if you want the firewall to verify
that RAs sent from other routers are advertising consistent information
on the link. The firewall logs any inconsistencies in a system log;
the type is ipv6nd. | |
Include DNS information in Router Advertisement | Select for the firewall to send DNS information
in NDP router advertisements from this IPv6 VLAN interface. The
other DNS Support fields in this table are visible only after you
select this option. | |
Server | Add one or more recursive
DNS (RDNS) server addresses for the firewall to send in NDP router
advertisements from this IPv6 VLAN interface. RDNS servers send
a series of DNS lookup requests to root DNS servers and authoritative
DNS servers to ultimately provide an IP address to the DNS client. You
can configure a maximum of eight RDNS servers that the firewall
sends— in the order listed from top to bottom—in an NDP router advertisement
to the recipient, which then uses them in the same order. Select
a server and Move Up or Move Down to
change the order of the servers or Delete a
server from the list when you no longer need it. | |
Lifetime | Enter the maximum number of seconds after
the IPv6 DNS client receives the router advertisement that it can
use the RDNS servers to resolve domain names (range is the value
of Max
Interval (sec) to twice the Max Interval; default is 1,200). | |
Suffix | Add and configure
one or more domain names (suffixes) for the DNS search list (DNSSL).
The maximum suffix length is 255 bytes. A DNS search list
is a list of domain suffixes that a DNS client router appends (one
at a time) to an unqualified domain name before it enters the name
into a DNS query, thereby using a fully qualified domain name in
the DNS query. For example, if a DNS client tries to submit a DNS
query for the name “quality” without a suffix, the router appends
a period and the first DNS suffix from the DNS search list to the
name and then transmits the DNS query. If the first DNS suffix on
the list is “company.com”, the resulting DNS query from the router
is for the fully qualified domain name “quality.company.com”. If
the DNS query fails, the router appends the second DNS suffix from
the list to the unqualified name and transmits a new DNS query.
The router tries DNS suffixes until a DNS lookup is successful (ignores
the remaining suffixes) or until the router has tried all of suffixes
on the list. Configure the firewall with the suffixes that
you want to provide to the DNS client router in a Neighbor Discovery
DNSSL option; the DNS client receiving the DNSSL option uses the
suffixes in its unqualified DNS queries. You can configure
a maximum of eight domain names (suffixes) for a DNS search list
that the firewall sends—in order listed from top to bottom—in an
NDP router advertisement to the recipient, which uses those addresses
in the same order. Select a suffix and Move Up or Move
Down to change the order or Delete a
suffix from the list when you no longer need it. | |
Lifetime | Enter the maximum number of seconds after
the IPv6 DNS client receives the router advertisement that it can
use a domain name (suffix) on the DNS search list (range is the
value of Max
Interval (sec) to twice the Max Interval; default is 1,200). | |