SRX

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Ask questions and share experiences about the SRX Series, vSRX, and cSRX.

  • 1.  Possible to not have DHCP client send DHCP release upon reboot/shutdown?

    Posted 01-28-2025 19:56

    Hi,

    I'm getting my toes wet on IPv6 and am discovering that if I perform an explicit "request dhcpv6 client renew interface ...." I get a new delegated prefix. During normal operation, my PD is renewed and is unchanged. Lease is 6 hours, the SRX renews every 3 hours. My guess is a warm/cold boot of would also give me a new PD. Under observations when I was using an older SRX, reboots would give me a new WAN IPv4 address, too.

    The concern I have is if I have any IPv6 firewall rules referencing any globally routable IPv6 IP they would be incorrect as soon as my PD changes. Is there a better way to manage PD changes for an SRX?

    I asked my ISP whether they support preserved delegated prefixes but while they couldn't tell me, suggested I keep my DHCP client from sending a DHCPrelease before reboot/shutdown. I can't find any option that allows this and feel a release is intrinsic to a shutdown/reboot procedure.

    Thanks!



  • 2.  RE: Possible to not have DHCP client send DHCP release upon reboot/shutdown?

    Posted 01-31-2025 21:06

    I have an srx300. Coincidently my delegated prefix is xxxx.xxxx.c300.xxxx::0, so, my conclusion is that within my local isp, which serves many, many people, the new ipv6 protocol memory space is a new frontier. Your completeness in configuration is vital. Remember, the srx series devices are static nature.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------

    Original Message