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Netis ST3326(ST-3302) [73/118] Dhcp snooping configuration
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expires.
If the DHCP client fails to update its IP address lease when half of the lease time elapses, it will
update its IP address lease by broadcasting a DHCP-REQUEST packet to the DHCP servers again
when seven-eighths of the lease time elapses. The DHCP server performs the same operations as
those described above.
DHCP Packet Format
DHCP has eight types of packets. They have the same format, but the values of some fields in the
packets are different. The DHCP packet format is based on that of the BOOTP packets.
Protocol Specification
Protocol specifications related to DHCP include:
RFC2131: Dynamic Host Configuration Protocol
RFC2132: DHCP Options and BOOTP Vendor Extensions
RFC1542: Clarifications and Extensions for the Bootstrap Protocol
RFC3046: DHCP Relay Agent Information option
DHCP Snooping Configuration
Introduction to DHCP Snooping
For the sake of security, the IP addresses used by online DHCP clients need to be tracked for the
administrator to verify the corresponding relationship between the IP addresses the DHCP clients
obtained from DHCP servers and the MAC addresses of the DHCP clients.
Layer 2 switches can track DHCP client IP addresses through the DHCP snooping function, which
listens DHCP broadcast packets.
Introduction to DHCP Snooping Trusted/Untrusted Ports
When an unauthorized DHCP server exists in the network, a DHCP client may obtains an illegal IP
address. To ensure that the DHCP clients obtain IP addresses from valid DHCP servers, The
switches can specify a port to be a trusted port or an untrusted port by the DHCP snooping
function.
Trusted: A trusted port is connected to an authorized DHCP server directly or indirectly. It
forwards DHCP messages to guarantee that DHCP clients can obtain valid IP addresses.
Untrusted: An untrusted port is connected to an unauthorized DHCP server. The DHCP-ACK
or DHCP-OFFER packets received from the port are discarded, preventing DHCP clients from
receiving invalid IP addresses.
Overview of DHCP-Snooping Option 82
Introduction to Option 82
Содержание
- Snmp management switch 1
- User s guide 1
- Copyright trademarks 2
- Fcc statement 2
- Intended audience 2
- Manual description 2
- Safety notices 2
- Table of contents 3
- Chapter 1 introduction 5
- Features 5
- Technical specifications 5
- The front panel 5
- The rear panel 6
- Ac power 7
- Chapter 2 mounting device 7
- Desktop or shelf installation 7
- Installation precautions 7
- Rack installation 7
- Chapter3 login the device 8
- Configure the computer 8
- Windows xp 8
- Windows 7 windows vista 11
- Check the connection 14
- Login the device 15
- Functional overview 16
- Chapter4 system 17
- System information 17
- The home page 17
- Ip address 18
- Password 19
- Mac address 20
- Management vlan 20
- Console 21
- System time config 21
- System update 21
- Backup recovery 22
- Load default 22
- Reboot 23
- Chapter5 snmp 24
- Snmp versions 24
- Understanding snmp 24
- Snmp community strings 25
- Snmp notifications 25
- Basic config 26
- Community 27
- Management station 27
- V3engine id 28
- V3group config 28
- V3user config 29
- V3view config 30
- Chapter6 port management 31
- Port configuration 31
- Band resrtricting 32
- Port statistics 32
- Figure 6 4 1 33
- Port description 33
- Port description can make a sign to the port which is convenient for you to find any useful information quickly 33
- Storm control 33
- Understanding storm control 33
- Figure 6 5 1 34
- Set and view limit of broadcast multicast unknown unicast flood level on port 34
- Chapter7 redundancy 35
- Introduction to lacp 35
- Introduction to link aggregation 35
- Understanding etherchannels 35
- Understanding load balancing and forwarding methods 36
- Link aggregation 37
- Basic concepts in smart link 38
- Master port 38
- Slave port 38
- Smart link group 38
- Basic concepts in monitor link 39
- Downlink port 39
- Monitor link group 39
- Smart monitor link 39
- Uplink port 39
- Introduce rrpp 40
- Rrpp domain 40
- Master node 41
- Rrpp control vlan 41
- Rrpp protected vlan 41
- Rrpp ring 41
- Common port and edge port 42
- Edge node and assistant edge node 42
- Primary port and secondary port 42
- Transit node 42
- Stp overview 44
- Background of mstp 47
- Mstp overview 47
- Basic mstp terminologies 48
- Principle of mstp 50
- Mstp implementation on switches 51
- Stp configure 52
- Stp related standards 52
- Mst configure 53
- Mstp port 54
- Acl overview 57
- Chapter8 security 57
- Understanding access control parameters 57
- Acl config 58
- Introduction to vlan 59
- Time range 59
- Advantages of vlans 60
- Mac config 62
- Introduction to mac address learning 63
- Introduction to mac address table 63
- Mac address overview 63
- Managing mac address table 63
- Mac address filter 64
- Static mac address 64
- Mac address learn 65
- Architecture of 802 x authentication 66
- Introduction to 802 x 66
- Mac aging time 66
- The mechanism of an 802 x authentication system 68
- X config 68
- X local 70
- X port 70
- Dhcp ip address assignment 71
- Introduction to dhcp 71
- Ip address assignment policy 71
- Obtaining ip addresses dynamically 72
- Updating ip address lease 72
- Dhcp packet format 73
- Dhcp snooping configuration 73
- Introduction to dhcp snooping 73
- Introduction to dhcp snooping trusted untrusted ports 73
- Overview of dhcp snooping option 82 73
- Protocol specification 73
- Overview of ip filtering 74
- Dhcp configuration 75
- Dhcp bind 76
- Dhcp server trust 77
- Option82 config 78
- Option82 policy 78
- Arp function 79
- Arp message format 79
- Arp table 79
- Introduction to arp 79
- Introduction to arp attack detection 80
- Introduction to arp packet rate limit 80
- Introduction to arp source mac address consistency check 80
- Arp config 81
- Arp limite rate 83
- Chapter9 qos 85
- Introduction to qos 85
- New applications and new requirements 85
- Traditional packet forwarding service 85
- Introduction to qos features 86
- Priority trust mode 86
- Traffic classification 86
- Configuring priority trust mode 87
- Priority marking 87
- Configuring queue scheduling 88
- Dscp queue mapping 89
- Qos information 89
- P queue mapping 91
- Port default priority 92
- Queue scheduling 92
- Chapter10 multicast 94
- Igmp versions 94
- Joining a multicast group 94
- Leaving a multicast group 94
- Understanding igmp snooping 94
- Igmp report suppression 95
- Immediate leave processing 95
- Igmp snooping 96
- Understanding multicast vlan registration 96
- Cross vlan 97
- Igmp route port 98
- Igmp port policy 99
- Igmp group policy 100
- Igmp version 101
- Chapter11 network analysis 102
- Port mirror 102
- Chapter12 ipstack 104
- Introduction to ipstack 104
- Ipstack 104
- Batch update 105
- Topology 106
- Chapter13 network euipment 107
- Loopback detection 107
- Chapter14 advanced setup 109
- Introduction to gvrp 109
- Operating mechanism of garp 109
- Gvrp config 110
- Protocol specifications 110
- Gvrp vlan info 111
- Ssh configuration 112
- Ssh auth and import 113
- Ssh user auth mode 113
- Figure 14 2 3 114
- Selective qinq overview 114
- Ssh authentication mode settings ssh authentication mode settings authentication mode password publickey or both username input username user host ip input user host ip pulbic key algorithm set algorithnm of publicy key rsa or dsa key file choose a key file 114
- Chapter15 save parameters 116
- But can t communication 117
- Can t login to manage switch 117
- Chapter16 faq 117
- Link status indicator don t shows normal link error 117
- Link status indicator show normal 117
- Switch start up failure 117
- Power failure 118
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