kresd answer from different IP

Hello, I hit weird behaviour of kresd and i think it is a bug. I have 1 public IP on the network interface and i also have another two public IPs od dummy interface. Kresd listen on all interfaces and when i send query to IP sitting on dummy iface, kresd send back response with SRC ip (probably) resolved from routing table - which is, in this case, IP of real network interface.

I think it is not correct behaviour. I cannot get response from different address. I try Unbound dns server it the same situation and it works good. Response came from requested IP.

My config is:

-- vim:syntax=lua:
-- Refer to manual: http://knot-resolver.readthedocs.org/en/latest/daemon.html#configuration

-- interfaces
net.ipv4 = true
net.ipv6 = true
net.listen({ '0.0.0.0', '::' }, 53)

-- drop privileges
user('kresd', 'kresd')

-- Load Useful modules
modules = {
        'policy',   -- Block queries to local zones/bad sites
        'view',     -- 
        'stats'     -- Track internal statistics
}

-- ACL
view:addr('15.62.0.0/15', function (req, qry) return policy.PASS end)
view:addr('128.13.5.67', function (req, qry) return policy.PASS end)
view:addr('2a01:bbbb:2:312:2222:2222::/64', function (req, qry) return policy.PASS end)
-- view:addr('0.0.0.0/0', function (req, qry) return policy.DROP end)

-- unmanaged DNSSEC root TA
trust_anchors.config('/etc/kresd/root.keys', nil)

cache.size = 2 * GB

Traffic dump:

14:38:37.908237 IP 128.15.1.67.42957 > 25.62.162.162.53: 17304+ [1au] A? centrum.cz. (39)
14:38:37.908443 IP 15.62.162.98.53 > 128.15.1.67.42957: 17304$ 1/0/1 A 46.255.231.48 (55)

IPs:

3: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    inet 15.62.162.98/30 brd 85.162.162.99 scope global ens192
       valid_lft forever preferred_lft forever
4: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN qlen 1000
    inet 15.62.162.162/32 brd 85.162.162.162 scope global dummy0
       valid_lft forever preferred_lft forever
5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN qlen 1000
    inet 15.62.162.85/32 brd 85.162.162.85 scope global dummy1

Routes:

default via 15.62.162.97 dev ens192  proto bird 
15.62.162.96/30 dev ens192  proto kernel  scope link  src 15.62.162.98 

Regards,

Daniel