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  • 1.  Firewall Filter

    This message was posted by a user wishing to remain anonymous
    Posted 14 days ago
    This message was posted by a user wishing to remain anonymous

    I want to create a firewall filter that should discard the NTP traffic forwarding through irb.100 having management IP- 10.85.241.50 and traffic should be forwarded only to respective two ntp servers i.e 10.4.10.36 & 10.4.10.37.




     



  • 2.  RE: Firewall Filter

    Posted 14 days ago
    Is this traffic originating from or destined to the Junos device itself or transit traffic passing through the irb.100 interface between an outside device and the ntp servers?

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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
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  • 3.  RE: Firewall Filter

    Posted 13 days ago
    The traffic is generated from irb.100 towards NTP servers.

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    Sanam Kaur
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  • 4.  RE: Firewall Filter

    Posted 5 days ago
    For traffic that has a source or destination of the Junos device itself we apply the firewall filter to the loopback address and this then applies to all traffic for the device.  These are called protect RE filters.  There is a full discussion on creating a comprehensive filter in this free day one book.

    https://supportportal.juniper.net/s/article/Securing-the-Routing-Engine-on-M-MX-and-T-Series?language=en_US

    You could just have the ntp only filtered by create a filter in the same format applied to the loopback with three terms
    • allow the ntp port out to the ntp server address
    • reject all ntp port outbound
    • allow all final rule


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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
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