RE: Question about failover with ISC DHCP
Oliver, Thank you very much for your prompt reply. Each school is allocated 16 class C's, (hopeful thinking that one day each student will have a computer) but they are not all configured. We only configure them as they need them, the largest school has only 5 class C's configured for their subnet. I will run as you suggest, and let you know. Thanks again. Luis -Original Message- From: Olivier Nicole [mailto:[EMAIL PROTECTED] Sent: Tuesday, August 14, 2007 9:10 PM To: Lacayo, Luis F Cc: freebsd-questions@freebsd.org Subject: Re: Question about failover with ISC DHCP Hi Luis, I am looking to replace my current DHCP server with the ISC. Right now I have to servers which are working with split scopes. Some of my schools need over 600 IP's, so I have the school with a 255.255.240.0 which give them 16 Class C, network, so to avoid conflicts I assign the 3 lower to one server and the 3 highest to the other.=20 This part is really not clear: you have 16 class C, and you assing 3 and 3? What about the 10 others? Now comes the question, in the following section there is a split of 128. If I give a range of 3 class C's do I set this value to 128 or (128*# Class C Networks)? =20 Fron man dhcpd.conf The split statement split index; The split statement specifies the split between the primary and sec- ondary for the purposes of load balancing. Whenever a client makes a DHCP request, the DHCP server runs a hash on the client identifica- tion. If the hash comes out to less than the split value, the pri- mary answers.If it comes out to equal to or more than the split, the secondary answers. The only meaningful value is 128, and can only be configured on the primary. This is certainly not giving much information, but they suggest you use 128, so try with 128 first. I'd suggest that you let the load balancing run for a while, then you can see how many clients are served by each DHCP server and you may try to fine adjust the split value. I have been using fail-over while I was preparing a new DHCP server recently (so the clients could start using the new server and the leases were transfered from the old to the new machine) and it was really seamless. Best regards, Olivier ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Question about failover with ISC DHCP
HI all, I am looking to replace my current DHCP server with the ISC. Right now I have to servers which are working with split scopes. Some of my schools need over 600 IP's, so I have the school with a 255.255.240.0 which give them 16 Class C, network, so to avoid conflicts I assign the 3 lower to one server and the 3 highest to the other. Now comes the question, in the following section there is a split of 128. If I give a range of 3 class C's do I set this value to 128 or (128*# Class C Networks)? Thank you in advance, Luis Luis F. Lacayo Chicago Public Schools ITS / Senior UNIX Administration [EMAIL PROTECTED] Office: 773-553-3835 Cell: 773 203-4493 The information contained in this communication is confidential, private, proprietary, or otherwise privileged and is intended only for the use of the addressee. Unauthorized use, disclosure, distribution or copying is strictly prohibited and may be unlawful. If you have received this communication in error, please notify the sender immediately at (773) 553-3835 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Question about failover with ISC DHCP
Lacayo, Luis F wrote: HI all, I am looking to replace my current DHCP server with the ISC. Right now I have to servers which are working with split scopes. Some of my schools need over 600 IP's, so I have the school with a 255.255.240.0 which give them 16 Class C, network, so to avoid conflicts I assign the 3 lower to one server and the 3 highest to the other. Now comes the question, in the following section there is a split of 128. If I give a range of 3 class C's do I set this value to 128 or (128*# Class C Networks)? Hi Luis, You don't need to have split scopes with ISC: they synchronize DHCP ACK's (and all other statuses) between each other. Setting up is POC... Peter -- http://www.boosten.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Question about failover with ISC DHCP
Hi Luis, I am looking to replace my current DHCP server with the ISC. Right now I have to servers which are working with split scopes. Some of my schools need over 600 IP's, so I have the school with a 255.255.240.0 which give them 16 Class C, network, so to avoid conflicts I assign the 3 lower to one server and the 3 highest to the other.=20 This part is really not clear: you have 16 class C, and you assing 3 and 3? What about the 10 others? Now comes the question, in the following section there is a split of 128. If I give a range of 3 class C's do I set this value to 128 or (128*# Class C Networks)? =20 Fron man dhcpd.conf The split statement split index; The split statement specifies the split between the primary and sec- ondary for the purposes of load balancing. Whenever a client makes a DHCP request, the DHCP server runs a hash on the client identifica- tion. If the hash comes out to less than the split value, the pri- mary answers.If it comes out to equal to or more than the split, the secondary answers. The only meaningful value is 128, and can only be configured on the primary. This is certainly not giving much information, but they suggest you use 128, so try with 128 first. I'd suggest that you let the load balancing run for a while, then you can see how many clients are served by each DHCP server and you may try to fine adjust the split value. I have been using fail-over while I was preparing a new DHCP server recently (so the clients could start using the new server and the leases were transfered from the old to the new machine) and it was really seamless. Best regards, Olivier ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
