Re: Heavy duty unbound

This could be related to your network topology.

If you have a real gateway with AS # (ASN) set properly, you should not see
this problem.

If you have a home router that serves your NAT, and your gateway is an ISP
port, and this port IP is mapped to your service IP (DNS, HTTP, etc) via
NAT, then any of your local network traffic to use your services tied to
this IP may experience the problem you had.
This is depending on what kind of internal router is behind the ISP modem.
If you have all in one Modem/Router, it is likely to see the problem. Some
routers may even prevent such traffic flow. This is because of the
All-in-one internal traffic rerouting.
If you have a separate Modem and Router, you can sniff the traffic between
the router and the modem, the traffic between the client and the router, as
well as between the router and the server, then you may find some
redirecting traffic issues, which causes CPU usage due to massive packet
dropping and resending.

-Jin

On Mon, Aug 8, 2022 at 3:21 PM Bahagia BAG <csf.server.bag@gmail.com> wrote:

> Hello All,
>
> I have unbound setup as a dns cache server
> The problem is if I give dns query traffic from my network, the server is
> very lagging
> and if i run top, unbound  is 166.43%
> sometimes I can't ssh login to the server
> I received an error log like this
>
> Limiting icmp unreach response from 203 to 193 packets/sec
> Limiting icmp unreach response from 222 to 197 packets/sec
> Limiting icmp unreach response from 228 to 194 packets/sec
>
> How can I tweak and optimize this server?
>
> Thanks in advance
>
> Baha Gia
>
>