| You are using an end-of-life BIND 9 on end-of-life Ubuntu. Start with that…
There is no point in debugging a version with unfixed bugs and security vulnerabilities.
Ondřej -- Ondřej Surý — ISC (He/Him)
My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours. On 14. 10. 2023, at 13:20, Mosharaf Hossain <mosharaf.hoss...@bol-online.com> wrote:
Hi All
Lately, we've been encountering an intriguing issue with our Auth+Recursive DNS server, characterized by relatively low traffic. Normally, our DNS server handles around 3 Mbps/second of traffic. However, at certain moments, when the load peaks at 4-5 Mbps, the DNS resolver's responsiveness falters.
To my understanding, this occurrence may be indicative of an ongoing DDoS attack during these periods. Nevertheless, I'm puzzled as to why the server seems to get stuck at 4-5 Mbps, considering that the LAN capacity is a substantial 1 Gbps.
I seek your guidance to address and resolve this recurrent issue.
Currnet BIND9 version : .10.3-P4-Ubuntu <id:ebd72b3>
Fig: Showing the suspicious traffic and during this time recursion unable to respond. <image.png>
Regards Mosharaf Hossain Manager, Product DevelopmentIT Division
Bangladesh Export Import Company Ltd.
Level-8, SAM Tower, Plot #4, Road #22, Gulshan-1, Dhaka-1212,Bangladesh Tel: +880 9609 000 999, +880 2 5881 5559, Ext: 14191, Fax: +880 2 9895757 Cell: +8801787680828, Email: mosharaf.hoss...@bol-online.com, Web: www.bol-online.com
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