Hi!
One of our customers uses Knot 2.6.7 as hidden master which sends
NOTIFYs to our slave service. He reported that Knot can not send the
NOTIFYs, ie:
knotd[10808]: warning: [example.com.] notify, outgoing,
2a02:850:8::6@53: failed (connection reset)
It seems that Knot sometimes tries to send the NOTIFY with TCP (I see
also NOTIFYs via UDP). Unfortunatelly our NOTIFY-receiver only supports UDP.
So, this is the first time seeing a name server sending NOTIFYs over
TCP. Is this a typical behavior in Knot? Can I force Knot to send
NOTIFYs always over UDP?
Thanks
Klaus
Hello
I am using ecdsap256sha256 as algorithm. Why does the KSK DNSKEY (=257) use as digest type SHA1 (=1) and not SHA256 (=2)?
For example:
> dig DNSKEY nic.cz | grep 257
nic.cz. 871 IN DNSKEY 257 3 13 LM4zvjUgZi2XZKsYooDE0HFYGfWp242fKB+O8sLsuox8S6MJTowY8lBD jZD7JKbmaNot3+1H8zU9TrDzWmmHwQ==
> dig DNSKEY nic.cz | grep 257 > dnspub.key
> jdnssec-dstool dnspub.key
nic.cz. 868 IN DS 61281 13 1 091CECC4D2AADB7AC8C4DF413DDF9C5B0B61E5B6
Regards
dp
Hello all,
my Knot DNS is now in production and I would like to setup some
backup tasks for the configuration and of course keys. Are there any
recommendations regarding backup? And restore? I can see that it is very
easy to dump current config but I am to sure how to backup keys. What do
you recommend? Save the content of /var/lib/knot on a hourly/daily
basis? I am not using shared keys.
Thanks
With regards
Ales
Hi
I have a question about this commit
“01b00cc47efe”
Replace select() by poll()?
The performance of epoll is better then select/poll when monitoring large
numbers of file descriptions.
Could you please let me why you choose poll()?
Thanks for your reply!
Dear all,
While trying to migrate or DNS to Knot I have noticed that a slave
server with 2GB RAM is facing memory exhaustion. I am running
2.6.5-1+0~20180216080324.14+stretch~1.gbp257446. There is 141 zones
having around 1MB in total. Knot is acting as pure slave server with
minimal configuration.
There is nearly 1.7GB of memory consumed by Knot on a freshly rebooted
server:
root@eira:/proc/397# cat status
Name: knotd
Umask: 0007
State: S (sleeping)
Tgid: 397
Ngid: 0
Pid: 397
PPid: 1
TracerPid: 0
Uid: 108 108 108 108
Gid: 112 112 112 112
FDSize: 64
Groups: 112
NStgid: 397
NSpid: 397
NSpgid: 397
NSsid: 397
VmPeak: 24817520 kB
VmSize: 24687160 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 1743400 kB
VmRSS: 1743272 kB
RssAnon: 1737088 kB
RssFile: 6184 kB
RssShmem: 0 kB
VmData: 1781668 kB
VmStk: 132 kB
VmExe: 516 kB
VmLib: 11488 kB
VmPTE: 3708 kB
VmPMD: 32 kB
VmSwap: 0 kB
HugetlbPages: 0 kB
Threads: 21
SigQ: 0/7929
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: fffffffe7bfbbefc
SigIgn: 0000000000000000
SigCgt: 0000000180007003
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
Seccomp: 0
Cpus_allowed: f
Cpus_allowed_list: 0-3
Mems_allowed: 00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 260
nonvoluntary_ctxt_switches: 316
root@eira:/proc/397#
Config:
server:
listen: 0.0.0.0@53
listen: ::@53
user: knot:knot
log:
- target: syslog
any: info
mod-rrl:
- id: rrl-10
rate-limit: 10 # Allow 200 resp/s for each flow
slip: 2 # Every other response slips
mod-stats:
- id: custom
edns-presence: on
query-type: on
request-protocol: on
server-operation: on
request-bytes: on
response-bytes: on
edns-presence: on
flag-presence: on
response-code: on
reply-nodata: on
query-type: on
query-size: on
reply-size: on
template:
- id: default
storage: "/var/lib/knot"
module: mod-rrl/rrl-10
module: mod-stats/custom
acl: [allowed_transfer]
disable-any: on
master: idunn
I was pretty sure that a VM with 2GB RAM is enough for my setup :-)
BR
Ales
Hello all,
I noticed that Knot (2.6.5) creates an RRSIG for the CDS/CDNSKEY RRset
with the ZSK/CSK only.
I was wondering if this is an acceptable behavior as RFC 7344, section
4.1. CDS and CDNSKEY Processing Rules states:
o Signer: MUST be signed with a key that is represented in both the
current DNSKEY and DS RRsets, unless the Parent uses the CDS or
CDNSKEY RRset for initial enrollment; in that case, the Parent
validates the CDS/CDNSKEY through some other means (see
Section 6.1 and the Security Considerations).
Specifically I read that "represented in both the current DNSKEY and DS
RRsets" means that the CDS/CDNSKEY RRset must be signed with a KSK/CSK
and not only with a ZSK and a trust chain to KSK <- DS.
I tested both BIND 9.12.1 and PowerDNS Auth 4.0.5 as well. PowerDNS Auth
behaves the same as Knot 2.6.5 but BIND 9.12.1 always signs the
CDS/CDNSKEY RRset with at least the KSK.
Do I read the RFC rule too strict? To be honest, I see nothing wrong
with the CDS/CDNSKEY RRset only signed by the ZSK but BINDs behavior and
the not so clear RFC statement keeps me wondering.
Thanks,
Daniel
I'm getting started with knot resolver and am a bit unclear as to how this
config should be structured.
The result I'm looking for is to forward queries to resolver A if the
source is subnet A; unless the query is for the local domain if so then
query the local DNS.
I've been working with the config below to accomplish this. However I'm
finding that this config will if the request does not match the local
todname and will use root hints if not but will not use the FORWARD server.
Ultimately, this server will resolve DNS for several subnets and will
forward queries to different servers based on the source subnet.
Would someone mind pointing me in the right direction on this, please?
for name, addr_list in pairs(net.interfaces()) do
net.listen(addr_list)
end
-- drop root
user('knot', 'knot')
-- Auto-maintain root TA
modules = {
'policy', -- Block queries to local zones/bad sites
'view', --view filters
'hints', -- Load /etc/hosts and allow custom root hints
'stats',
}
-- 4GB local cache for record storage
cache.size = 4 * GB
--If the request is from eng subnet
if (view:addr('192.168.168.0/24')) then
if (todname('localnet.mydomain.com')) then
policy.add(policy.suffix(policy.FORWARD('192.168.168.1'),
{todname('localnet.mydomain.com')}))
else
view:addr('192.168.168.0/24', policy.FORWARD('68.111.106.68'))
end
end
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