[bind-users] Slow reply under heavy load (on a specific NIC ip)

Jerry Kemp dns.bind.list47 at oryx.us
Mon Jun 4 15:42:30 UTC 2018

Can you please provide some specifics about your setup that is experiencing the problem?

HW - Sparc, PPC, Intel x86/x64, ARM ?

OS - what OS is the problem occurring on?

specific BIND version?

anything about the NIC in question, possibly to include mfg && model number, if relevant?


On 04/06/18 07:20, Ict Security wrote:
> Hi guys,
> we are running a Bind 9.x Server, everything is going fine.
> Under particular heavy load mometns, with some hundreds of concurrent
> queries coming in, sometime Bing stops answering for some seconds or
> answer with important delays.
> But, when i try to query the same server/same Bind on a NIC alias IP
> during congestion on the main IP, everything is fast!
> I changed some tunings in:
> max-connections in /proc
> txqueue in network
> ipv4_ports
> and i mitigate something.
> But it is not completely solved.
> Do you think Bind could have some NIC IP limit?
> Some ideas?
> Really thank you!
> Francesco
> _______________________________________________

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