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USG2130 in the transparent mode doesn’t transparent transport multicast and broadcast packets

Publication Date:  2012-10-15 Views:  72 Downloads:  0
Issue Description
dhcp server -------- usg2130 --------- pc
usg2130 works in transparent mode, the attached users can not automatically obtain the ip address that dhcp server issued
Alarm Information
Handling Process
1. Directly linked the pc to the dhcp server, pc can automatically obtain the ip address. Prove dhcp server has no problem
2. Carefully check usg2130 data configuration, there is no problem too.
3. In global mode configure the following command to solve the problem:
       firewall unknown-mac multicast flood              multicast
      firewall unknown-mac broadcast flood              broadcast
Root Cause
1, dhcp server problem
2, usg2130 configuration problem
3, firewall works in transparent mode, not transparent transport broadcast and multicast packets
Firewall in transparent mode default to discard the unknown mac address.
Suggests that when the firewall works in transparent mode configure:

firewall unknown-mac broadcast flood;
firewall unknown-mac multicast flood
Avoid dhcp ospf and other multicast or broadcast services unavailable.