Re: Heavy duty unbound

For providing DNS caching services at the ISP level I’d suggest looking into dnsdist. It’s probably better suited to that than unbound. 

Personally, for a smallish ISP, I’d be running PowerDNS for authoritative and resolvers, fronted by dnsdist. 

However, the primary problem remains your unreachable problems, and you’ll probably have to sniff your traffic and figure out what is happening.  So far as I know, none of these tools have different configurations based on whether you are behind NAT, have an ASN, etc. 

--Jon Radel
jon@radel.com

> On Aug 10, 2022, at 7:18 AM, Bahagia BAG <csf.server.bag@gmail.com> wrote:
> 
> 
> Hello Jin
> 
> Thanks for your reply, Can you show me where can I learn how to setup with ASN, since this server is for ISP and have ASN
> 
> Best Regards
> 
> Baha Gia
> 
>> On Tue, Aug 9, 2022 at 6:37 AM jin guojun <jguojun@gmail.com> wrote:
>> 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
>>>