DNS Type Query Support Added to the DNS Analyzer
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1 DNS Type Query Support Added to the DNS Analyzer This chapter describes the following topics: Feature Summary and Revision History, page 1 Feature Changes, page 2 Command Changes, page 4 Performance Indicator Changes, page 5 Feature Summary and Revision History Summary Data Applicable Product(s) or Functional Area Applicable Platform(s) ECS ASR 5500 VPC - DI VPC - SI Feature Default Disabled - Configuration Required Related Changes in This Release Not Applicable Related Documentation Command Line Interface Reference ECS Administration Guide 1
2 Feature Changes DNS Type Query Support Added to the DNS Analyzer Revision History Important Revision history details are not provided for features introduced before releases 21.2 and N5.5. Revision Details In this release, the DNS analyzer (ECS) is enhanced to query the DNS type. This capability supports zero-rating on A type of queries and DNS tunneling on TXT and NULL type queries. First introduced. Release 21.4 Pre 21.2 Feature Changes The DNS analyzer currently does not detect the type of DNS query nor does it perform zero-rating on A type DNS queries. The new command dns query-type is introduced to enable the DNS analyzer (ECS) to query the DNS type to counter DNS fraud without huge impacts. This capability supports zero-rating on A type of queries and DNS tunneling on TXT and NULL type queries. The Rule Match engine is enabled to support matching based on the query type. The dns query-type command defines rule expressions to match the query type in the DNS request messages. This command is added under the ACS Ruledef Configuration Mode. The following call flow displays how the DNS analyzer (ECS) detects the type of DNS query. 2
3 DNS Type Query Support Added to the DNS Analyzer Feature Changes Previous Behavior DNS query types based rule-matching never occurred. If there were multiple answers, unsupported query-type skipped parsing the complete answer. New Behavior The following DNS query types can be configured in a ruledef. These are parsed and rule-matched. A CNAME NS PTR SRV 3
4 Command Changes DNS Type Query Support Added to the DNS Analyzer AAAA TXT ANY NULL If there are multiple answers, unsupported query-type skips parsing only that answer and continues parsing the next answer. Customer Impact DNS packets now start matching the query-type ruledefs. Command Changes dns query-type This new command is added under the ACS Ruledef Configuration mode to define rule expressions to match the query type in the DNS request messages. When enabled, the dns query-type CLI supports the following behavior: DNS request with only one query is supported. DNS response with multiple answers is supported. Query-type corresponding to all the answers is stored and matched to the highest priority ruledef. For DNS response with multiple answers, unsupported query-type (mentioned previously) is skipped and parsing continues for remaining answers. For TXT and NULL query types, minimal parsing occurs like only a DNS record is created and query-type is stored. Answer-name is not extracted and hence the corresponding EDR field is not populated. For NULL query types, response is not parsed and matching is based on the same ruledef as a Request. configure active-charging service service_name ruledef ruledef_name [ no ] dns query-type operator query_type end Notes: no: Disables this feature, that is, the query-name ruleline is removed from the DNS protocol. operator: Specifies how to match. operator must be one of the following: =: Specifies that the query-name must be equal to the one specified.!=: Specifies that the query-name must not be equal to the one specified. query-type: Specifies the type of queries supported: a, cname, ns, ptr, srv, aaaa, txt, any, and null. 4
5 DNS Type Query Support Added to the DNS Analyzer Performance Indicator Changes This CLI is disabled by default. Performance Indicator Changes show active-charging analyzer statistics name dns The output of this command now includes the following new fields (TXT and NULL query types) depending on whether the CLI is enabled or disabled: show active-charging analyzer statistics name dns ACS DNS Session Stats: Total Uplink Bytes: 0 Total Downlink Bytes: 0 Total Uplink Pkts: 0 Total Downlink Pkts: 0 Unknown OPCODE: 0 Invalid Pkts: 0 DNS Over TCP: Uplink Bytes: 0 Downlink Bytes: 0 Uplink Pkts: 0 Downlink Pkts: 0 Request: A Query Type: 0 CNAME Query Type: 0 NS Query Type: 0 PTR Query Type: 0 SRV Query Type: 0 Unknown Query Type: 0 AAAA Query Type: 0 TXT Query Type: 0 NULL Query Type: 0 Response: A Query Type: 0 CNAME Query Type: 0 NS Query Type: 0 PTR Query Type: 0 SRV Query Type: 0 Unknown Query Type: 0 AAAA Query Type: 0 TXT Query Type: 0 NULL Query Type: 0 5
6 show active-charging analyzer statistics name dns DNS Type Query Support Added to the DNS Analyzer 6
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