still seeing some delays in lookups

Re: still seeing some delays in lookups

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I'd like the instructions for compiling it my self, with that option
disabled.

On 11/12/04 2:54 PM, "Men & Mice Support" <cbuxton@menandmice.com> wrote:

> It's possible that the EDNS (extended DNS) packet size is an issue.
> Unfortunately, the ends-udp-size option is not yet compatible with
> QuickDNS, because QuickDNS Remote won't recognize it and will have a
> problem.
>
> BIND 9.3.0 can be compiled without this feature. We can create a
> compiled version like that for anyone who'd like to try it and report
> back whether it helps.
>
> The issue here is that, before EDNS, UDP packets in DNS use were
> limited to 512 bytes. This is because, historically, the UDP
> transport layer was limited to 512 bytes per packet. EDNS allows a
> sort of negotiation between two DNS servers to determine optimal
> packet size (i.e. the largest size of packet that will arrive intact
> at the other end). These limits are now being expanded.
>
> With EDNS, the servers at either end can negotiate a larger maximum
> packet size. Unfortunately, this takes a little time. Fortunately,
> the information can be cached.
>
> Chris Buxton
> Men & Mice - Making DNS Easy
> Customer Service and Sales Engineer
>
> At 2:37 PM -0800 11/12/04, Jody McAlister wrote:
>> The mac os x server list had a "fix" which goes one step beyond the
>> fix that was given here. I still see a lookup issue, less than
>> before (but I am using firefox and Safari which everybody seem to
>> say have that problem currently), but the lookups still seem a
>> little slower than what I'm used to as well.
>>
>> Here is an email I pasted in about making an adjustment to the udp
>> packet that they claim solved their problem. Does this seem like a
>> solution or just an unneccessary extra step. I don't see that he
>> tried with bind 9.3.0 before changing the packet size.
>>
>> ******************************************************************
>> Hello everyone,
>>
>> Thanks for the replies from all. It does seem the DNS timeout issue I
>> mentioned this morning isn't OS X Server related. In fact, it seems to be
>> some type of bug involving BSD, IPv6 and Bind 9.2.x... Apparently some of
>> the root servers started issuing IPv6 replies in the past few weeks
>> causing the issue to crop up. There is a good discussion in this thread
>> here:
>> http://discussions.info.apple.com/webx?14@123.Votva3t2BDi.0@.689de754/0
>>
>> While not a "proper" solution, my solution to this problem was to compile
>> Bind 9.3.0 on our XServe. I renamed the old named binary and put the new
>> one in its place. Also, I edited the system startup script so it launches
>> bind -4 (IPv4 support ONLY) instead of just bind. Lastly, I changed the
>> edns-udp-size to limit the packet size to 512 bytes. All of these
>> together have solved this issue, at least in our environment.
>>
>> I encourage anyone experiencing the original symptoms to check out the
>> discussion linked above and try out the fix I did.
>>
>> Thanks everyone
>> Mike
>
>

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