Hi Harshith
On Thu, Jun 22, 2017 at 05:36:12AM -0700, Harshith Mulky wrote:
> Client
> DNS
> EDNS query, buffer size=4096
> ------------------------------------------------------->
>
> DNS Response, Truncation bit set (TC=1)
> <-------------------------------------------------------
>
> DNS Query over TCP
> ------------------------------------------------------->
>
> DNS Response over TCP
> <------------------------------------------------------
>
> In the above Call Scenario, I have the Client supporting, edns Buffer
> Size=4096. and on the server, I have enabled this: to limit the server
> sending > 512 bytes in Response
>
> server 0.0.0.0/0 {
> edns yes;
> edns-udp-size 512; //max size query sever can receive is upto 4096
> bytes(default value=4096 )
> max-udp-size 512; //max size server can transfer is upto 4096
> bytes(default value =4096)
> };
It is not clear what it is you're trying to achieve from the config
block above, but it isn't a good idea to limit to 512 for /0.
> The EDNS query is OK, the response is also OK
>
> The question is regarding the DNS Query over TCP,
> Can the DNS Query over TCP include the OPT RR section, is this not
> Applicable to only UDP? is there any RFC which supports OPT RR section for
> query over TCP
Yes, the OPT RR carries other information and EDNS options between
client<->nameserver. E.g., without the OPT RR, how will a client tell
the nameserver that DNSSEC is OK (DO=1) ?
> Bit 0 (DO bit): 1 (Accepts DNSSEC security RRs)
Mukund
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