CN1411210A - Method of acting address analytic protocol Ethernet Switch in application - Google Patents
Method of acting address analytic protocol Ethernet Switch in application Download PDFInfo
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- CN1411210A CN1411210A CN 02104082 CN02104082A CN1411210A CN 1411210 A CN1411210 A CN 1411210A CN 02104082 CN02104082 CN 02104082 CN 02104082 A CN02104082 A CN 02104082A CN 1411210 A CN1411210 A CN 1411210A
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Abstract
This invention relates to a method for ARP in BAS, namely a medium device sends ARP reply paper to source who sent the request on behalf of the destination. To the effective ARP request paper of legal source IP address customer, BAS examines APRCAHE to see if three are user IP addresses with the aim of asking analytics, if not BASF will not reply if, if so, it will compare further the source IP address user with the destination IP address user to see if the virtual LAN marks are the same, if not, BAS will send ARP reply information to source IP data paper to the IP address user at destination. If source and destination IP address user at destination. If source and destination IP address are at the same BAS interface, BAS sends ARP reply information to source user too with access unit MAC.
Description
Technical field
The present invention relates to the broadband access technology field, relate to a kind ofly in Virtual Local Area Network Ethernet broadband access media gateway or rather, the processing method of Proxy Address Resolution Protocol (Proxy ARP) can be applicable in the Ethernet access service.
Background technology
Usually, network interface can only communicate mutually according to user's 2 layer address, and 2 layer address obtain from 3 layer address by ARP(Address Resolution Protocol).If interface A sends data will for the interface B that is in the same network segment with it, and A only knows the IP address of B, and it must search the physical address of B according to the IP address of B earlier.It sends an ARP broadcasting that contains the IP address of B, and the physical address of request B after B receives this broadcasting, is responded its physical address to A.As A and B during not at the same network segment, A only sends the ARP request to the router of next jumping, rather than directly sends to B.
Referring to Fig. 1, be a kind of Virtual Local Area Network Ethernet broadband access network structure, the annexation between BAS Broadband Access Server shown in the figure (BAS), LAN switch LSW (LAN SWITCH) and subscriber's main station (as A, B).
Insert in the application at Ethernet, BAS Broadband Access Server (BAS) need provide professional distribution and aggregation feature and functions such as user management, safety management and authentication and accounting are provided as cut-in convergent equipment to the user.Isolate in order to support the service traffics between the user, User Access Layer often adopts the method for dividing VLAN at 2 layer switch LSW, to be divided into a plurality of logical subnetworks by the physical network that LAN switch LSW and subscriber's main station connect into, promptly the user port A of a LSW (LAN SWITCH) can lay respectively among the different VLAN with user port B, shown in dotted line circle among the figure, VLAN1 supports subscriber's main station A, and VLAN2 supports subscriber's main station B.
Because the broadcast data packet that website sent among VLAN will only be forwarded to the website that belongs to same VLAN with it, so can not arrive user port B from the broadcasting packet of port A this moment.But when the subscriber's main station B IP address allocated of the subscriber's main station A IP address allocated of connectivity port A and port B is to be positioned at the same network segment and need be based on the TCP/IP communication time, according to the ARP agreement, when user A need send out IP and wraps to user B, should at first send physics (MAC) address that the ARP request message comes inquiring user B, but because the isolated user of the causing B of VLAN can not receive this ARP message, just must reply this ARP request message by BAS this moment, and promptly BAS need support proxy arp function.ARP(Address Resolution Protocol) is used for network layer (3 layers) map addresses exactly to data link layer (2 layers) address.
BAS supports proxy ARP also to need to consider the situation of supporting a plurality of subscriber's main stations below the vlan port, because a plurality of users self under vlan port can intercommunication, in this case, even BAS receives that the ARP request message does not need to reply yet, and should directly carry out arp reply by the user.
In sum, at present in the Ethernet broadband access, also there is not a kind ofly can guarantee that the service traffics between the user isolate the method for Proxy Address Resolution Protocol in the time of to support to insert normal communication between the user again.
Summary of the invention
The objective of the invention is to design the method that a kind of Ethernet inserts Proxy Address Resolution Protocol in the application, the processing method of this kind proxy ARP in VLAN Ethernet broadband access media gateway, not only support a VLANID to insert a user's situation, and support a VLAN ID that a plurality of users' situation is arranged, the subscriber's main station in the sub-virtual net of different VLAN is communicated each other.In the Ethernet broadband access, can guarantee that the service traffics between the user are isolated, can support to insert the normal communication between the user again.
The technical scheme that realizes the object of the invention is such: the method for Proxy Address Resolution Protocol during a kind of Ethernet inserts and uses is characterized in that comprising following treatment step:
A. BAS Broadband Access Server receives effective address analysis protocol (ARP) request message from the source IP address user, contains the purpose user's IP address in this message;
B. BAS Broadband Access Server checks whether have the purpose user's IP address that request address is resolved in the access information table (ARP CACHE);
When C. in access information table (ARP CACHE), having the purpose user's IP address that request address resolves, the further consistency between source IP address user and purpose IP address user's VLAN tag (VLAN ID) relatively;
D. when source IP address user and purpose IP address user's VLAN tag (VLAN ID) is inconsistent, send the ARP(Address Resolution Protocol) response message with the physical address of its access unit to the source IP address user by BAS Broadband Access Server;
E. the source IP address user sends to BAS Broadband Access Server with the IP datagram literary composition after receiving the ARP(Address Resolution Protocol) response message, searches route by BAS Broadband Access Server this IP datagram literary composition is sent to purpose IP address user;
When F. in access information table (ARP CACHE), not having the purpose user's IP address of request address parsing, or in access information table (ARP CACHE), have a purpose user's IP address that request address is resolved, but when source IP address user and purpose IP address user's VLAN tag (VLAN ID) is inconsistent, BAS Broadband Access Server does not send the ARP(Address Resolution Protocol) response message to the source IP address user, sends the IP datagram literary composition to purpose IP address user after the source IP address user receives the ARP(Address Resolution Protocol) response message that purpose IP address user sends.
In the described steps A, also comprise by BAS Broadband Access Server and inquire about described access information table (ARP CACHE), the ARP(Address Resolution Protocol) request message that is present in the source IP address user in the access information table (ARP CACHE) is judged as effective message.
In the described steps A, also comprise by BAS Broadband Access Server and judge whether source IP address user and purpose IP address user are in the same interface of BAS Broadband Access Server, physical address with this access unit of BAS Broadband Access Server during for same interface sends the ARP(Address Resolution Protocol) response message to the source IP address user, and the source IP address user sends the IP datagram literary composition to purpose IP address user after receiving this ARP(Address Resolution Protocol) response message.
Described access information table (ARP CACHE) is the table of comparisons that is based upon relation between IP address in the BAS Broadband Access Server and its physical address (MAC) in user authentication process.
Proxy Address Resolution Protocol of the present invention (Proxy ARP) is a kind of variation of ARP agreement, under this form, represents destination to send an arp reply to the main frame that sends request by the intermediate equipment of router one class.
The method of Proxy Address Resolution Protocol of the present invention, also promptly in the Ethernet IAD, realize the method for ARP proxy, match with the existing vlan technology of User Access Layer, in the Ethernet broadband access, can guarantee that the service traffics between the user isolate fully, can support to insert the normal communication between the user again, method is effective and simple and clear.
Description of drawings
Fig. 1 is a kind of Virtual Local Area Network Ethernet broadband access network structural representation;
Fig. 2 be of the present invention in Ethernet insert to be used the method flow block diagram of Proxy Address Resolution Protocol.
Embodiment
Also combination is referring to Fig. 1 referring to Fig. 2, and Proxy Address Resolution Protocol (ARP) in the BAS Broadband Access Server (BAS) also is that BAS Broadband Access Server (BAS) receives the method that the ARP request is divided into groups, and comprises following treatment step:
User A receives from behind party B-subscriber's arp reply message, the IP message is sent to the party B-subscriber; After perhaps user A receives arp reply message from BAS, the IP message is issued this access unit of BAS, be responsible for searching route by BAS this IP message is sent to user B, thereby successfully realized communication problem between the user of Ethernet in inserting.
Of the present invention above-mentioned effectively and brief realization method match with the vlan technology of User Access Layer, in the Ethernet broadband access, can guarantee that the service traffics between the user are isolated fully, can support to insert the normal communication between the user again.
Implementation method of the present invention proves to have good practicability and reliability through using in the EXPERT media gateway device.
Claims (4)
1. the method for Proxy Address Resolution Protocol during an Ethernet inserts and uses is characterized in that comprising following treatment step:
A. BAS Broadband Access Server receives effective address analysis protocol (ARP) request message from the source IP address user, contains the purpose user's IP address in this message;
B. BAS Broadband Access Server checks whether have the purpose user's IP address that request address is resolved in the access information table (ARP CACHE);
When C. in access information table (ARP CACHE), having the purpose user's IP address that request address resolves, the further consistency between source IP address user and purpose IP address user's VLAN tag (VLAN ID) relatively;
D. when source IP address user and purpose IP address user's VLAN tag (VLAN ID) is inconsistent, send the ARP(Address Resolution Protocol) response message with the physical address of its access unit to the source IP address user by BAS Broadband Access Server;
E. the source IP address user sends to BAS Broadband Access Server with the IP datagram literary composition after receiving the ARP(Address Resolution Protocol) response message, searches route by BAS Broadband Access Server this IP datagram literary composition is sent to purpose IP address user;
When F. in access information table (ARP CACHE), not having the purpose user's IP address of request address parsing, or in access information table (ARP CACHE), have a purpose user's IP address that request address is resolved, but when source IP address user and purpose IP address user's VLAN tag (VLAN ID) is inconsistent, BAS Broadband Access Server does not send the ARP(Address Resolution Protocol) response message to the source IP address user, sends the IP datagram literary composition to purpose IP address user after the source IP address user receives the ARP(Address Resolution Protocol) response message that purpose IP address user sends.
2. the method for Proxy Address Resolution Protocol during a kind of Ethernet according to claim 1 inserts and uses, it is characterized in that: in the described steps A, also comprise by BAS Broadband Access Server and inquire about described access information table (ARP CACHE), to being present in the access information table (ARP CACHE)
3. the method for Proxy Address Resolution Protocol during a kind of Ethernet according to claim 1 inserts and uses, it is characterized in that: in the described steps A, also comprise by BAS Broadband Access Server and judge whether source IP address user and purpose IP address user are in the same interface of BAS Broadband Access Server, physical address with this access unit of BAS Broadband Access Server during for same interface sends the ARP(Address Resolution Protocol) response message to the source IP address user, and the source IP address user sends the IP datagram literary composition to purpose IP address user after receiving this ARP(Address Resolution Protocol) response message.
4. the method for Proxy Address Resolution Protocol during a kind of Ethernet according to claim 1 inserts and uses is characterized in that: described access information table (ARP CACHE) is the table of comparisons that concerns between IP address and its physical address (MAC) that is based upon in user authentication process in the BAS Broadband Access Server.
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- 2002-03-08 CN CNB021040826A patent/CN1177439C/en not_active Expired - Fee Related
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