NTP Server Not Reachable

Asset ID:	1-71-1671875.1
Update Date:	2014-06-12
Keywords:

Solution Type Technical Instruction Sure

Solution 1671875.1 : NTP Server Not Reachable

Applies to:

Acme Packet 3820 - Version S-Cx6.1.0 to S-Cx6.4.0 [Release S-Cx6.0]
Acme Packet 4500 - Version S-Cx6.1.0 to S-Cz7.2.0 [Release S-Cx6.0 to S-Cz7.0]
Net-Net 4250 - Version S-C4.1.4 to S-C6.2.0 [Release S-C4.0 to S-C6.0]
Net-Net 3810 - Version S-Cx6.1.0 to S-Cx6.4.0 [Release S-Cx6.0]
Information in this document applies to any platform.

Goal

Acmepacket SBC sending out NTP requests but dropping NTP responses.

Solution

This issue can happen in two scenarios
1) NTP is routed through media interface. This is not supported. NTP requests should always be routed out of the wancom0 interface
2) NTP is being routed through wancom0 , but the NTP servers IP is not added to the system-access-list with other IPs. NOTE: By default there are no system-access-list and NTP should work in that case.

Attachments

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