Junos OS

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IP Unnumbered and DHCP Netmask

  • 1.  IP Unnumbered and DHCP Netmask

    Posted 12-24-2020 11:32

    I have dhcp running with a dynamic-profile.  I am getting the pool from RADIUS in Framed-Pool attribute.  My pool is a /25 and the first IP excluded and is a /32 loopback address.  My dynamic-profile is using unnumbered lo0.0.  DHCP works, but its handing the client a /32 netmask and some clients take this fine, but others break as they don't see the gateway (the unnumbered loopback IP) as being in the same subnet.

    Will JunOS always advertise a /32 in DHCP when doing unnumbered interfaces or can it advertise the netmask as it is configured in the IP pool?

    If I send a Radius-Framed-Netmask that does work and override it, however I can't really do that reliably as the masks vary.  Why isn't the BNG just using the POOL's  "network" prefix-length?



  • 2.  RE: IP Unnumbered and DHCP Netmask

    Posted 12-31-2020 03:32

    I had same problem, what I did. If you use freeradius comment line Framed-IP-Netmask in freeradius dictionary.rfc2865 restart radius. Now you will get netmask from your dynamic pool.




  • 3.  RE: IP Unnumbered and DHCP Netmask

    Posted 12-31-2020 09:43
    I never saw that net
    mask attribute even being returned in my accept packet response from radius.