DHCP Pool Static Client Configuration(Juniper vMX)

1. DHCP Pool Static Client Configuration 구성도

1) DHCP Pool Static Client Configuration 구성도

• DHCP 기본 개념, DHCP 동작 과정, DHCP Basic Configuration을 먼저 학습하는 것을 권고

 

2) 테스트 장비

• Emulator : EVE-NG
• OS : Juniper vMX 18.2R1.9

 

 

2. DHCP Pool Static Client Configuration

1) DHCP Server IRB Configuration

< DHCP-SERVER : VLAN 설정 >
set bridge-domains VLAN10 vlan-id 10
set bridge-domains VLAN10 routing-interface irb.10

< DHCP-SERVER : Interface 설정 >
set interfaces ge-0/0/0 unit 0 family bridge interface-mode access
set interfaces ge-0/0/0 unit 0 family bridge vlan-id 10
set interfaces ge-0/0/1 unit 0 family bridge interface-mode access
set interfaces ge-0/0/1 unit 0 family bridge vlan-id 10
set interfaces irb unit 10 family inet address 10.0.0.1/24

 

2) DHCP Pool Configuration

< DHCP-SERVER : Pool 설정 >
set access address-assignment pool POOL-10 family inet network 10.0.0.0/24
set access address-assignment pool POOL-10 family inet range RANGE-1 low 10.0.0.100
set access address-assignment pool POOL-10 family inet range RANGE-1 high 10.0.0.200
set access address-assignment pool POOL-10 family inet dhcp-attributes maximum-lease-time 120
set access address-assignment pool POOL-10 family inet dhcp-attributes domain-name JUNIPER.NET
set access address-assignment pool POOL-10 family inet dhcp-attributes name-server 8.8.8.8
set access address-assignment pool POOL-10 family inet dhcp-attributes name-server 8.8.4.4
set access address-assignment pool POOL-10 family inet dhcp-attributes wins-server 100.0.0.2
set access address-assignment pool POOL-10 family inet dhcp-attributes wins-server 100.0.0.3
set access address-assignment pool POOL-10 family inet dhcp-attributes router 10.0.0.1
set access address-assignment pool POOL-10 family inet dhcp-attributes boot-file /A/B/C
set access address-assignment pool POOL-10 family inet dhcp-attributes tftp-server 100.0.0.1
set access address-assignment pool POOL-10 family inet excluded-range RANGE-1 low 10.0.0.100
set access address-assignment pool POOL-10 family inet excluded-range RANGE-1 high 10.0.0.150
set access address-assignment pool POOL-10 family inet host CLIENT-1 hardware-address 50:00:00:1e:00:02		## Static IP Address를 구성할 Client MAC Address를 구성
set access address-assignment pool POOL-10 family inet host CLIENT-1 ip-address 10.0.0.200					## 위에서 설정한 Client에게 할당할 IP Address를 설정

• Cisco와 달리 Juniper는 하나의 Pool에 Static Host 설정 가능
• 위에서 설정한 MAC Address를 가진 클라이언트가 Discover 메시지 전송 시, 해당 IP Address를 할당

 

< DHCP-SERVER : DHCP Server Interface 설정 >
set system services dhcp-local-server group LOCAL-SERVER interface irb.10

 

3) DHCP CLIENT-1 Configuration(Static Pool)

< CLIENT-1 : DHCP IP Address 설정 >
set interfaces ge-0/0/0 unit 0 family inet dhcp

• 클라이언트가 처음 Discover 메시지에 Broadcast Flag를 1로 전송하여 Offer 및 Ack 메시지를 Broadcast로 전송
• 클라이언트는 IP Address를 할당받고 충돌이 발생하는지 확인하기 위해 GARP Request를 전송

 

• Allocation, Renewal, Rebinding, Release 동작 때 발생하는 메시지도 일반적인 DHCP 메시지와 동일
• 서버는 Discover 메시지의 Client MAC Address 부분을 확인하여 미리 설정한 IP Address를 할당

 

4) DHCP CLIENT-2 Configuration

< CLIENT-2 : DHCP IP Address 설정 >
set interfaces ge-0/0/0 unit 0 family inet dhcp

• 클라이언트가 처음 Discover 메시지에 Broadcast Flag를 1로 전송하여 Offer 및 Ack 메시지를 Broadcast로 전송
• 클라이언트는 IP Address를 할당받고 충돌이 발생하는지 확인하기 위해 GARP Request를 전송

 

 

5) DHCP CLIENT-1 확인

root@CLIENT-1> show route 

inet.0: 3 destinations, 3 routes (3 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

0.0.0.0/0          *[Access-internal/12] 00:06:32, metric 0
                    > to 10.0.0.1 via ge-0/0/0.0
10.0.0.0/24        *[Direct/0] 00:06:33
                    > via ge-0/0/0.0
10.0.0.200/32      *[Local/0] 00:06:33
                      Local via ge-0/0/0.0

root@CLIENT-1> show dhcp client binding       
IP address        Hardware address   Expires     State      Interface
10.0.0.200        50:00:00:1e:00:02  71          BOUND      ge-0/0/0.0

root@CLIENT-1> show dhcp client binding detail 

Client Interface/Id: ge-0/0/0.0
     Hardware Address:             50:00:00:1e:00:02
     State:                        BOUND(LOCAL_CLIENT_STATE_BOUND)
     Lease Expires:                2024-11-25 13:41:22 UTC
     Lease Expires in:             68 seconds
     Lease Start:                  2024-11-25 13:39:22 UTC
     Server Identifier:            10.0.0.1
     Client IP Address:            10.0.0.200
     Update Server                 No

DHCP options:
    Name: dhcp-lease-time, Value: 2 minutes
    Name: server-identifier, Value: 10.0.0.1
    Name: router, Value: [ 10.0.0.1 ]
    Name: name-server, Value: [ 8.8.8.8, 8.8.4.4 ]
    Name: boot-file, Value: /A/B/C
    Name: subnet-mask, Value: 255.255.255.0
    Name: domain-name, Value: JUNIPER.NET
    Name: wins-server, Value: [ 100.0.0.2, 100.0.0.3 ]

 

6) DHCP CLIENT-2 확인

root@CLIENT-2> show route 

inet.0: 3 destinations, 3 routes (3 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

0.0.0.0/0          *[Access-internal/12] 00:01:35, metric 0
                    > to 10.0.0.1 via ge-0/0/0.0
10.0.0.0/24        *[Direct/0] 00:01:36
                    > via ge-0/0/0.0
10.0.0.151/32      *[Local/0] 00:01:36
                      Local via ge-0/0/0.0

root@CLIENT-2> show dhcp client binding 
IP address        Hardware address   Expires     State      Interface
10.0.0.151        50:00:00:31:00:02  73          BOUND      ge-0/0/0.0

root@CLIENT-2> show dhcp client binding detail     

Client Interface/Id: ge-0/0/0.0
     Hardware Address:             50:00:00:31:00:02
     State:                        BOUND(LOCAL_CLIENT_STATE_BOUND)
     Lease Expires:                2024-11-25 13:41:34 UTC
     Lease Expires in:             68 seconds
     Lease Start:                  2024-11-25 13:39:34 UTC
     Server Identifier:            10.0.0.1
     Client IP Address:            10.0.0.151
     Update Server                 No

DHCP options:
    Name: dhcp-lease-time, Value: 2 minutes
    Name: server-identifier, Value: 10.0.0.1
    Name: router, Value: [ 10.0.0.1 ]
    Name: name-server, Value: [ 8.8.8.8, 8.8.4.4 ]
    Name: boot-file, Value: /A/B/C
    Name: subnet-mask, Value: 255.255.255.0
    Name: domain-name, Value: JUNIPER.NET
    Name: wins-server, Value: [ 100.0.0.2, 100.0.0.3 ]

 

7) DHCP SERVER 확인

root@DHCP-SERVER> show dhcp server binding
IP address        Session Id  Hardware address   Expires     State      Interface
10.0.0.200        1           50:00:00:1e:00:02  66          BOUND      irb.10
10.0.0.151        2           50:00:00:31:00:02  79          BOUND      irb.10

root@DHCP-SERVER> show dhcp server binding detail 

Client IP Address:  10.0.0.200
     Hardware Address:             50:00:00:1e:00:02
     State:                        BOUND(LOCAL_SERVER_STATE_BOUND)
     Protocol-Used:                DHCP
     Lease Expires:                2024-11-25 13:43:22 UTC
     Lease Expires in:             64 seconds
     Lease Start:                  2024-11-25 13:33:20 UTC
     Last Packet Received:         2024-11-25 13:41:22 UTC
     Incoming Client Interface:    irb.10:ge-0/0/0.0
     Server Identifier:            10.0.0.1
     Session Id:                   1
     Client Pool Name:             POOL-10
Client IP Address:  10.0.0.151
     Hardware Address:             50:00:00:31:00:02
     State:                        BOUND(LOCAL_SERVER_STATE_BOUND)
     Protocol-Used:                DHCP
     Lease Expires:                2024-11-25 13:43:35 UTC
     Lease Expires in:             77 seconds
     Lease Start:                  2024-11-25 13:38:34 UTC
     Last Packet Received:         2024-11-25 13:41:35 UTC
     Incoming Client Interface:    irb.10:ge-0/0/1.0
     Server Identifier:            10.0.0.1
     Session Id:                   2    
     Client Pool Name:             POOL-10