Re: configurations issue for broadcastclient inLinux machine - NTP

This is a discussion on Re: configurations issue for broadcastclient inLinux machine - NTP ; On Tuesday, May 15, 2007 at 8:28 AM Danny Mayer [mailto:mayer@ntp.isc.org] wrote: > Do you know why it's insisting on sending the packet out to the > 255.255.255.255 IP Address? > The problem is that cisco seems to use the ...

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Thread: Re: configurations issue for broadcastclient inLinux machine

  1. Re: configurations issue for broadcastclient inLinux machine

    On Tuesday, May 15, 2007 at 8:28 AM
    Danny Mayer [mailto:mayer@ntp.isc.org] wrote:


    > Do you know why it's insisting on sending the packet out to the
    > 255.255.255.255 IP Address?


    > The problem is that cisco seems to use the all broadcast address.


    I believe Cisco IOS does indeed broadcast to all-1s by default, but I make
    it broadcast to the subnet-broadcast-address like this:

    interface FastEthernet0/1
    ip address 172.17.1.1 255.255.255.0
    ip broadcast address 172.17.1.255
    ntp broadcast key 1001 destination 172.17.1.255

    ntp authenticate
    ntp authentication-key 1001 md5
    ntp authentication-key 1002 md5
    ntp trusted-key 1001
    ntp trusted-key 1002
    ntp broadcastdelay 3000
    ntp server 158.43. etc. etc.
    ntp peer 172.17.6.200 key 1002
    ntp peer 172.17.7.200 key 1002 etc. etc.

    Apologies for being so late responding to this.
    I was on the verge of responding, when I discovered my authentication was
    "broken".
    Hope it is still of interest.

    Mike.

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  2. Re: configurations issue for broadcastclient inLinux machine

    mike.keighley@adare.com wrote:
    > On Tuesday, May 15, 2007 at 8:28 AM
    > Danny Mayer [mailto:mayer@ntp.isc.org] wrote:
    >
    >
    >> Do you know why it's insisting on sending the packet out to the
    >> 255.255.255.255 IP Address?

    >
    >> The problem is that cisco seems to use the all broadcast address.

    >
    > I believe Cisco IOS does indeed broadcast to all-1s by default, but I make
    > it broadcast to the subnet-broadcast-address like this:
    >
    > interface FastEthernet0/1
    > ip address 172.17.1.1 255.255.255.0
    > ip broadcast address 172.17.1.255
    > ntp broadcast key 1001 destination 172.17.1.255
    >
    > ntp authenticate
    > ntp authentication-key 1001 md5
    > ntp authentication-key 1002 md5
    > ntp trusted-key 1001
    > ntp trusted-key 1002
    > ntp broadcastdelay 3000
    > ntp server 158.43. etc. etc.
    > ntp peer 172.17.6.200 key 1002
    > ntp peer 172.17.7.200 key 1002 etc. etc.
    >
    > Apologies for being so late responding to this.
    > I was on the verge of responding, when I discovered my authentication was
    > "broken".
    > Hope it is still of interest.
    >
    > Mike.


    Yes, it's still of interest. I'm in the process of fixing a number of
    broadcast issues and those fixes should be available in the next day or two.

    Danny
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