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AskF5 | Manual Chapter: About Virtual Servers

Rsdaa 06/12/2021 300

['

About

', '

Virtual

', '

Servers

', '

Introduction

', '

to

', '

virtual

', '

servers

', '

A

', '

virtual

', '

server

', '

is

', '

one

', '

of

', '

the

', '

most

', '

important

', '

components

', '

of

', '

any

', '

BIG-IP

', '

®

', '

system

', '

configuration.

', '

A

', '

virtual

', '

server

', '

is

', '

a

', '

traffic-management

', '

object

', '

on

', '

the

', '

BIG-IP

', '

system

', '

that

', '

is

', '

represented

', '

by

', '

a

', '

virtual

', '

IP

', '

address

', '

and

', '

a

', '

service,

', '

such

', '

as

', '

192.168.20.10:80

', '

.

', '

When

', '

clients

', '

on

', '

an

', '

external

', '

network

', '

send

', '

application

', '

traffic

', '

to

', '

virtual

', '

server,

', '

the

', '

virtual

', '

server

', '

listens

', '

for

', '

that

', '

traffic

', '

and,

', '

through

', '

destination

', '

address

', '

translation,

', '

directs

', '

the

', '

traffic

', '

according

', '

to

', '

the

', '

way

', '

that

', '

you

', '

configured

', '

the

', '

settings

', '

on

', '

the

', '

virtual

', '

server.

', '

A

', '

primary

', '

purpose

', '

of

', '

a

', '

virtual

', '

server

', '

is

', '

to

', '

distribute

', '

traffic

', '

across

', '

a

', '

pool

', '

of

', '

servers

', '

that

', '

you

', '

specify

', '

in

', '

the

', '

virtual

', '

server

', '

configuration.

', '

o

', '

customize

', '

the

', '

way

', '

that

', '

the

', '

BIG-IP

', '

system

', '

processes

', '

various

', '

types

', '

of

', '

traffic,

', '

you

', '

can

', '

assign

', '

profiles

', '

to

', '

a

', '

virtual

', '

server.

', '

For

', '

example,

', '

through

', '

profile

', '

assignment,

', '

a

', '

virtual

', '

server

', '

can

', '

enable

', '

compression

', '

on

', '

HTTP

', '

request

', '

data

', '

as

', '

it

', '

passes

', '

through

', '

the

', '

BIG-IP

', '

system,

', '

or

', '

decrypt

', '

and

', '

re-encrypt

', '

SSL

', '

connections

', '

and

', '

verify

', '

SSL

', '

certificates.

', '

For

', '

each

', '

type

', '

of

', '

traffic,

', '

such

', '

as

', '

TCP,

', '

UDP,

', '

HTTP,

', '

SSL,

', '

SIP,

', '

and

', '

FTP,

', '

you

', '

can

', '

assign

', '

a

', '

custom

', '

profile

', '

to

', '

the

', '

virtual

', '

server

', '

or

', '

use

', '

the

', '

default

', '

profile.

', '

When

', '

you

', '

create

', '

a

', '

virtual

', '

server,

', '

you

', '

specify

', '

the

', '

pool

', '

or

', '

pools

', '

that

', '

you

', '

want

', '

to

', '

use

', '

as

', '

the

', '

destination

', '

for

', '

any

', '

traffic

', '

coming

', '

from

', '

that

', '

virtual

', '

server.

', '

You

', '

also

', '

configure

', '

its

', '

general

', '

properties,

', '

profiles,

', '

SNATs,

', '

and

', '

other

', '

resources

', '

you

', '

want

', '

to

', '

assign

', '

to

', '

it,

', '

such

', '

as

', '

iRules

', '

or

', '

session

', '

persistence

', '

types.

', '

Note:

', '

To

', '

ensure

', '

that

', '

a

', '

server

', '

response

', '

returns

', '

through

', '

the

', '

BIG-IP

', '

system,

', '

you

', '

can

', '

either

', '

configure

', '

the

', '

default

', '

route

', '

on

', '

the

', '

server

', '

to

', '

be

', '

a

', '

self

', '

IP

', '

address

', '

on

', '

an

', '

internal

', '

VLAN,

', '

or

', '

you

', '

can

', '

create

', '

a

', '

SNAT

', '

and

', '

assign

', '

it

', '

to

', '

a

', '

virtual

', '

server.

', '

Types

', '

of

', '

virtual

', '

servers

', '

You

', '

can

', '

create

', '

several

', '

different

', '

types

', '

of

', '

virtual

', '

servers,

', '

depending

', '

on

', '

your

', '

particular

', '

configuration

', '

needs.

', '

Table

', '

1.

', '

Types

', '

of

', '

virtual

', '

servers

', '

Type

', '

Description

', '

Standard

', '

A

', '

Standard

', '

virtual

', '

server

', '

(also

', '

known

', '

as

', '

a

', '

load

', '

balancing

', '

virtual

', '

server)

', '

directs

', '

client

', '

traffic

', '

to

', '

a

', '

load

', '

balancing

', '

pool

', '

and

', '

is

', '

the

', '

most

', '

basic

', '

type

', '

of

', '

virtual

', '

server.

', '

When

', '

you

', '

first

', '

create

', '

the

', '

virtual

', '

server,

', '

you

', '

assign

', '

an

', '

existing

', '

default

', '

pool

', '

to

', '

it.

', '

From

', '

then

', '

on,

', '

the

', '

virtual

', '

server

', '

automatically

', '

directs

', '

traffic

', '

to

', '

that

', '

default

', '

pool.

', '

Forwarding

', '

(Layer

', '

2)

', '

You

', '

can

', '

set

', '

up

', '

a

', '

Forwarding

', '

(Layer

', '

2)

', '

virtual

', '

server

', '

to

', '

share

', '

the

', '

same

', '

IP

', '

address

', '

as

', '

a

', '

node

', '

in

', '

an

', '

associated

', '

VLAN.

', '

To

', '

do

', '

this,

', '

you

', '

must

', '

perform

', '

some

', '

additional

', '

configuration

', '

tasks.

', '

These

', '

tasks

', '

consist

', '

of:

', '

creating

', '

a

', '

VLAN

', '

group

', '

that

', '

includes

', '

the

', '

VLAN

', '

in

', '

which

', '

the

', '

node

', '

resides,

', '

assigning

', '

a

', '

self-IP

', '

address

', '

to

', '

the

', '

VLAN

', '

group,

', '

and

', '

disabling

', '

the

', '

virtual

', '

server

', '

on

', '

the

', '

relevant

', '

VLAN.

', '

Forwarding

', '

(IP)

', '

A

', '

Forwarding

', '

(IP)

', '

virtual

', '

server

', '

is

', '

just

', '

like

', '

other

', '

virtual

', '

servers,

', '

except

', '

that

', '

a

', '

forwarding

', '

virtual

', '

server

', '

has

', '

no

', '

pool

', '

members

', '

to

', '

load

', '

balance.

', '

The

', '

virtual

', '

server

', '

simply

', '

forwards

', '

the

', '

packet

', '

directly

', '

to

', '

the

', '

destination

', '

IP

', '

address

', '

specified

', '

in

', '

the

', '

client

', '

request.

', '

When

', '

you

', '

use

', '

a

', '

forwarding

', '

virtual

', '

server

', '

to

', '

direct

', '

a

', '

request

', '

to

', '

its

', '

originally-specified

', '

destination

', '

IP

', '

address,

', '

the

', '

BIG-IP

', '

system

', '

adds,

', '

tracks,

', '

and

', '

reaps

', '

these

', '

connections

', '

just

', '

as

', '

with

', '

other

', '

virtual

', '

servers.

', '

You

', '

can

', '

also

', '

view

', '

statistics

', '

for

', '

a

', '

forwarding

', '

virtual

', '

servers.

', '

Performance

', '

(HTTP)

', '

A

', '

Performance

', '

(HTTP)

', '

virtual

', '

server

', '

is

', '

a

', '

virtual

', '

server

', '

with

', '

which

', '

you

', '

associate

', '

a

', '

Fast

', '

HTTP

', '

profile.

', '

Together,

', '

the

', '

virtual

', '

server

', '

and

', '

profile

', '

increase

', '

the

', '

speed

', '

at

', '

which

', '

the

', '

virtual

', '

server

', '

processes

', '

HTTP

', '

requests.

', '

Performance

', '

(Layer

', '

4)

', '

A

', '

Performance

', '

(Layer

', '

4)

', '

virtual

', '

server

', '

is

', '

a

', '

virtual

', '

server

', '

with

', '

which

', '

you

', '

associate

', '

a

', '

Fast

', '

L4

', '

profile.

', '

Together,

', '

the

', '

virtual

', '

server

', '

and

', '

profile

', '

increase

', '

the

', '

speed

', '

at

', '

which

', '

the

', '

virtual

', '

server

', '

processes

', '

Layer

', '

4

', '

requests.

', '

Stateless

', '

A

', '

stateless

', '

virtual

', '

server

', '

prevents

', '

the

', '

BIG-IP

', '

system

', '

from

', '

putting

', '

connections

', '

into

', '

the

', '

connection

', '

table

', '

for

', '

wildcard

', '

and

', '

forwarding

', '

destination

', '

IP

', '

addresses.

', '

When

', '

creating

', '

a

', '

stateless

', '

virtual

', '

server,

', '

you

', '

cannot

', '

configure

', '

SNAT

', '

automap,

', '

iRules,

', '

or

', '

port

', '

translation,

', '

and

', '

you

', '

must

', '

configure

', '

a

', '

default

', '

load

', '

balancing

', '

pool.

', '

Note

', '

that

', '

this

', '

type

', '

of

', '

virtual

', '

server

', '

applies

', '

to

', '

UDP

', '

traffic

', '

only.

', '

Reject

', '

A

', '

Reject

', '

virtual

', '

server

', '

specifies

', '

that

', '

the

', '

BIG-IP

', '

system

', '

rejects

', '

any

', '

traffic

', '

destined

', '

for

', '

the

', '

virtual

', '

server

', '

IP

', '

address.

', '

DHCP

', '

A

', '

DHCP

', '

virtual

', '

server

', '

relays

', '

Dynamic

', '

Host

', '

Control

', '

Protocol

', '

(DHCP)

', '

messages

', '

between

', '

clients

', '

and

', '

servers

', '

residing

', '

on

', '

different

', '

IP

', '

networks.

', '

Known

', '

as

', '

a

', '

DHCP

', '

relay

', '

agent

', '

,

', '

a

', '

BIG-IP

', '

system

', '

with

', '

a

', '

DHCP

', '

type

', '

of

', '

virtual

', '

server

', '

listens

', '

for

', '

DHCP

', '

client

', '

messages

', '

being

', '

broadcast

', '

on

', '

the

', '

subnet

', '

and

', '

then

', '

relays

', '

those

', '

messages

', '

to

', '

the

', '

DHCP

', '

server.

', '

The

', '

DHCP

', '

server

', '

then

', '

uses

', '

the

', '

BIG-IP

', '

system

', '

to

', '

send

', '

the

', '

responses

', '

back

', '

to

', '

the

', '

DHCP

', '

client.

', '

Configuring

', '

a

', '

DHCP

', '

virtual

', '

server

', '

on

', '

the

', '

BIG-IP

', '

system

', '

relieves

', '

you

', '

of

', '

the

', '

tasks

', '

of

', '

installing

', '

and

', '

running

', '

a

', '

separate

', '

DHCP

', '

server

', '

on

', '

each

', '

subnet.

', '

Internal

', '

An

', '

internal

', '

virtual

', '

server

', '

is

', '

one

', '

that

', '

can

', '

send

', '

traffic

', '

to

', '

an

', '

intermediary

', '

server

', '

for

', '

specialized

', '

processing

', '

before

', '

the

', '

standard

', '

virtual

', '

server

', '

sends

', '

the

', '

traffic

', '

to

', '

its

', '

final

', '

destination.

', '

For

', '

example,

', '

if

', '

you

', '

want

', '

the

', '

BIG-IP

', '

system

', '

to

', '

perform

', '

content

', '

adaptation

', '

on

', '

HTTP

', '

requests

', '

or

', '

responses,

', '

you

', '

can

', '

create

', '

an

', '

internal

', '

virtual

', '

server

', '

that

', '

load

', '

balances

', '

those

', '

requests

', '

or

', '

responses

', '

to

', '

a

', '

pool

', '

of

', '

ICAP

', '

servers

', '

before

', '

sending

', '

the

', '

traffic

', '

back

', '

to

', '

the

', '

standard

', '

virtual

', '

server.

', '

An

', '

internal

', '

virtual

', '

server

', '

supports

', '

both

', '

TCP

', '

and

', '

UDP

', '

traffic.

', '

Creating

', '

a

', '

virtual

', '

server

', '

Before

', '

creating

', '

a

', '

virtual

', '

server,

', '

verify

', '

that

', '

you

', '

have

', '

created

', '

the

', '

pool

', '

to

', '

which

', '

you

', '

want

', '

this

', '

virtual

', '

server

', '

to

', '

send

', '

traffic.

', '

When

', '

you

', '

create

', '

a

', '

virtual

', '

server,

', '

you

', '

specify

', '

a

', '

destination

', '

IP

', '

address

', '

and

', '

service

', '

port.

', '

All

', '

other

', '

settings

', '

on

', '

the

', '

virtual

', '

server

', '

have

', '

default

', '

values.

', '

You

', '

can

', '

change

', '

the

', '

default

', '

values

', '

of

', '

any

', '

settings

', '

to

', '

suit

', '

your

', '

needs.

', '

On

', '

the

', '

Main

', '

tab,

', '

click

', '

Local

', '

Traffic

', '

>

', '

Virtual

', '

Servers

', '

.

', '

The

', '

Virtual

', '

Server

', '

List

', '

screen

', '

opens.

', '

Click

', '

the

', '

Create

', '

button.

', '

The

', '

New

', '

Virtual

', '

Server

', '

screen

', '

opens.

', '

In

', '

the

', '

Name

', '

field,

', '

type

', '

a

', '

unique

', '

name

', '

for

', '

the

', '

virtual

', '

server.

', '

In

', '

the

', '

Destination

', '

Address

', '

field,

', '

type

', '

the

', '

IP

', '

address

', '

in

', '

CIDR

', '

format.

', '

The

', '

supported

', '

format

', '

is

', '

address/prefix,

', '

where

', '

the

', '

prefix

', '

length

', '

is

', '

in

', '

bits.

', '

For

', '

example,

', '

an

', '

IPv4

', '

address/prefix

', '

is

', '

10.0.0.1

', '

or

', '

10.0.0.0/24

', '

,

', '

and

', '

an

', '

IPv6

', '

address/prefix

', '

is

', '

ffe1::0020/64

', '

or

', '

2001:ed8:77b5:2:10:10:100:42/64

', '

.

', '

When

', '

you

', '

use

', '

an

', '

IPv4

', '

address

', '

without

', '

specifying

', '

a

', '

prefix,

', '

the

', '

BIG-IP

', '

®

', '

system

', '

automatically

', '

uses

', '

a

', '

/32

', '

prefix.

', '

Note:

', '

The

', '

IP

', '

address

', '

for

', '

this

', '

field

', '

needs

', '

to

', '

be

', '

on

', '

the

', '

same

', '

subnet

', '

as

', '

the

', '

external

', '

self-IP

', '

address.

', '

In

', '

the

', '

Service

', '

Port

', '

field,

', '

type

', '

a

', '

port

', '

number

', '

or

', '

select

', '

a

', '

service

', '

name

', '

from

', '

the

', '

Service

', '

Port

', '

list.

', '

Configure

', '

any

', '

other

', '

settings

', '

as

', '

needed.

', '

If

', '

this

', '

type

', '

of

', '

virtual

', '

server

', '

forwards

', '

traffic

', '

to

', '

a

', '

pool,

', '

then

', '

in

', '

the

', '

Resources

', '

area

', '

of

', '

the

', '

screen,

', '

from

', '

the

', '

Default

', '

Pool

', '

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than

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virtual

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server.

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Networks

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recommends

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define

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transparent

', '

nodes

', '

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need

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than

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the

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node

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About

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You

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Each

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In

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set

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distribute

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You

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create

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another

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About

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the

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associate

', '

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For

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192.168.20.10:80

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,

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the

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You

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servers

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For

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the

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', '

servers

', '

192.168.20.10:80

', '

,

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192.168.20.10:443

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,

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and

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192.168.20.10:161

', '

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the

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You

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create

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', '

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virtual

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address

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', '

you

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create

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a

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virtual

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server,

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if

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the

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virtual

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address

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not

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However,

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', '

the

', '

properties

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of

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a

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virtual

', '

address,

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disable

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address.

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When

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virtual

', '

address,

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none

', '

of

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the

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servers

', '

associated

', '

with

', '

that

', '

address

', '

can

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receive

', '

incoming

', '

network

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traffic.

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When

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you

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create

', '

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', '

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', '

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', '

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', '

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', '

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address

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', '

address.

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This

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in

', '

turn

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', '

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to

', '

respond

', '

to

', '

Address

', '

Resolution

', '

Protocol

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requests

', '

for

', '

the

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virtual

', '

address,

', '

and

', '

to

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send

', '

gratuitous

', '

ARP

', '

requests

', '

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', '

responses

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with

', '

respect

', '

to

', '

the

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address.

', '

As

', '

an

', '

option,

', '

you

', '

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', '

disable

', '

ARP

', '

activity

', '

for

', '

virtual

', '

addresses,

', '

in

', '

the

', '

rare

', '

case

', '

that

', '

ARP

', '

activity

', '

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', '

system

', '

performance.

', '

This

', '

most

', '

likely

', '

occurs

', '

only

', '

when

', '

you

', '

have

', '

a

', '

large

', '

number

', '

of

', '

virtual

', '

addresses

', '

defined

', '

on

', '

the

', '

system.

', '

About

', '

virtual

', '

address

', '

creation

', '

You

', '

create

', '

a

', '

virtual

', '

address

', '

indirectly

', '

when

', '

you

', '

create

', '

the

', '

first

', '

virtual

', '

server

', '

with

', '

a

', '

destination

', '

address

', '

that

', '

includes

', '

the

', '

virtual

', '

address.

', '

You

', '

do

', '

not

', '

explicitly

', '

create

', '

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', '

virtual

', '

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', '

For

', '

example,

', '

if

', '

you

', '

create

', '

a

', '

virtual

', '

server

', '

with

', '

a

', '

destination

', '

address

', '

of

', '

192.168.30.22:80

', '

,

', '

the

', '

BIG-IP

', '

®

', '

system

', '

automatically

', '

creates

', '

the

', '

virtual

', '

address

', '

192.168.30.22

', '

.

', '

Viewing

', '

virtual

', '

address

', '

properties

', '

Using

', '

the

', '

BIG-IP™

', '

Configuration

', '

utility,

', '

you

', '

can

', '

view

', '

the

', '

properties

', '

of

', '

an

', '

existing

', '

virtual

', '

address

', '

on

', '

the

', '

BIG-IP

', '

system.

', '

On

', '

the

', '

Main

', '

tab,

', '

click

', '

Local

', '

Traffic

', '

>

', '

Virtual

', '

Servers

', '

.

', '

The

', '

Virtual

', '

Server

', '

List

', '

screen

', '

displays

', '

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list

', '

of

', '

existing

', '

virtual

', '

servers.

', '

On

', '

the

', '

menu

', '

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', '

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', '

Virtual

', '

Address

', '

List

', '

.

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This

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', '

the

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When

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Whenever

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When

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Configuration

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Connection

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Note:

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F5

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the

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', '

CMP

', '

for

', '

a

', '

virtual

', '

server,

', '

or

', '

you

', '

can

', '

enable

', '

CMP

', '

for

', '

a

', '

specific

', '

CPU.

']

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