CM DHCP Filter | docsis.org

You are here

CM DHCP Filter

2 posts / 0 new
Last post
kdavid
CM DHCP Filter

Hello,

is there any way to filter DHCP server packets in CM Config file from client cable modem to not sent it back to network?
thanx
Dave

mbowe
Probably the simplest fix is

Probably the simplest fix is to put an ACL on your CMTS bundle interface :
eg. on the IN ACL :
deny udp any eq bootps any

And/or you could put some rules in the CM config file. eg
/* permit non-matched IP */
SnmpMibObject docsDevFilterIpDefault.0 Integer 2; /* accept */

/* block DHCPv4 server */
SnmpMibObject docsDevFilterIpIfIndex.11 Integer 1 ;
SnmpMibObject docsDevFilterIpDirection.11 Integer 1; /* inbound */
SnmpMibObject docsDevFilterIpProtocol.11 Integer 17 ;
SnmpMibObject docsDevFilterIpSourcePortLow.11 Integer 67 ;
SnmpMibObject docsDevFilterIpSourcePortHigh.11 Integer 67 ;
SnmpMibObject docsDevFilterIpDestPortLow.11 Integer 68 ;
SnmpMibObject docsDevFilterIpDestPortHigh.11 Integer 68 ;
SnmpMibObject docsDevFilterIpStatus.11 Integer 4; /* createAndGo */

Log in or register to post comments