PPPOE users attached to MA5200F cannot access static user

Publication Date:  2012-07-27 Views:  87 Downloads:  0
Issue Description

PPPOE users attached to MA5200F cannot access static user


PPPOE users and static user are under the same port, and in the same VLAN access. 



Alarm Information
No

Handling Process
1. Make sure the static user does not enable firewall, and is not configured with data to limit access;

2. At MA5200F, PPPOE users and static user support mutual access internally;


3. After checkup on data, it is found that static user and PPPOE users use the same address pool, and it could confirm that it is the configuration of mask for static user that results in failure of mutual access.


Analysis: For example, the gateway of address pool is 192.168.0.1, with mask as 255.255.255.0


PPPOE users use the address within 192.168.0.2-192.168.0.100.


Static user uses address 192.168.0.254 and mask of 255.255.255.0.


Then, in case PPPOE user of 192.168.0.2 request to access static user 192.168.0.254, packets are forwarded by MA5200F to static user, but when static user responds ACK packets to PPPOE static user, it will request the MAC address of the PPPOE user first due to that both users are in the same network segment. However, PPPOE user refuses to respond the ARP request, so static user cannot learn the MAC of PPPOE user, resulting in failure of access. After the mask is adjusted, both users are not in the same network segment, and the packets sent by static user to PPPOE user is forwarded by gateway (MA5200); therefore, the problem is solved.


Solution: adjust the address pool used by static users, making the mask incapable of covering the network segment of PPPOE users. The access recovers to normal.  

Root Cause
   1. Static user is configured with ACL, limiting the access of PPPOE users;

2. The relationship of access between two users at MA5200F is deny;



3. The configuration of computer fails the access;

 

END