One of the 13 root DNS servers (c.root-servers.net), which supports the root zone of DNS (the initial link in the domain name resolving chain that provides information about DNS servers serving top-level domains and keys for their verification using DNSSEC), was out of sync with the other root DNS servers for four days. The operation of the root DNS server 'C' (192.33.4.12) is supported by 12 servers located in different countries. All these servers, from May 18 to 22, did not reflect changes in the root zone, returned outdated data, and did not synchronize with the rest of the DNS root infrastructure. <\/p>\n
During the specified period, no changes were made to the root zone, but work was planned to update the DNSSEC digital signature for the top-level domain '.gov', which was being conducted as part of the transition to cryptographic keys based on the ECDSA algorithm. For the '.gov' zone, algorithms 8 (RSA\/SHA-256) and 13 (ECDSA P-256\/SHA-256) have recently been used for DNSSEC signing, but algorithm 8 remains active. Over the weekend, it was planned to add a DS record for algorithm 13 to the root zone, after which the process of deleting the DS record for algorithm 8 would begin. A similar replacement was also planned for the '.int' domain. As a result, the DS records associated with supporting algorithm 13 for the root zone were transferred to IANA but were never published, as the key replacement process was suspended following the identification of issues until the situation with root server 'C' was clarified. servers<\/a> The work of the root DNS server 'C' is provided under agreements with the ICANN corporation by the Tier 1 backbone provider Cogent Communications, which operates in 53 countries. Several days before the incident, issues were reported with access from the Cogent Communications network to 1575 autonomous systems due to the cessation of peering with the Indian Tier 1 provider Tata Communications. <\/p>\n The root DNS server «C» operates based on agreements with the ICANN corporation, provided by the Tier 1 backbone provider Cogent Communications, which is present in 53 countries. A few days before the incident, issues were noted with access from the Cogent Communications network to 1575 autonomous systems due to the termination of peering with the Indian Tier 1 provider Tata Communications. <\/p>\n The reason for the cessation of updates for the root DNS zone is attributed to a failure in the monitoring system responsible for tracking changes. The failure occurred after a routing change that was unrelated to the operation of DNS servers (detailed information about the causes is not yet provided). Apart from the desynchronization, no violations in processing requests to the root DNS server 'C' have been recorded. Synchronization was fully restored on May 22 at 7 PM (MSK). Among the potential issues that could arise during an extended desynchronization, there is a possibility of providing outdated information regarding the keys used in DNSSEC and the addresses of the DNS servers servicing them. domains<\/a> the first level. \u041e\u0434\u0438\u043d \u0438\u0437 13 \u043a\u043e\u0440\u043d\u0435\u0432\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 DNS (c.root-servers.net), \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0440\u0430\u0431\u043e\u0442\u0443 \u043a\u043e\u0440\u043d\u0435\u0432\u043e\u0439 \u0437\u043e\u043d\u044b DNS (\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0435 \u0437\u0432\u0435\u043d\u043e \u0432 \u0446\u0435\u043f\u043e\u0447\u043a\u0435 \u0440\u0435\u0437\u043e\u043b\u0432\u0438\u043d\u0433\u0430 \u0434\u043e\u043c\u0435\u043d\u043d\u044b\u0445 \u0438\u043c\u0451\u043d, \u043e\u0442\u0434\u0430\u044e\u0449\u0435\u0435 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 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Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"