DNS Redirect & RD flag

[Kevin Darcy]

scyoon at dacom.net wrote:

> From: À±¼ºÃ¶ 4267 at DACOM on 2000-02-25 01:25 PM
>
> To:   bind-users at isc.org
> cc:
> Subject:  DNS Redirect & RD flag
>
>   Hi, All
>
>   I have some questions on testing the DNS redirection Using Layer-4
>   switch(Alteon 180e).
>
>   For this test, the network is configured like below,
>
>        Client(PC)/DNS Server A (caching only:Linux 6.1, BIND 8.1.2) - Router -
>   L4 Switch - Router - Internet
>
>   and L4 switch is direct-connected with DNS server B (Primary:Solaris 2.7, BIND
>   8.2.2).
>
>   All DNS packets are redirected to DNS Server B by L4 switch.
>
>   I tested two cases. One is that the client pc send the query packet(client's
>   DNS Server is not Server A, B),
>   another is DNS server A(DNS Server A is not a forwarder).
>   The first case received the correct answer from DNS server B, but the latter
>   case didn't work well.
>
>   To serve recursion service at DNS server B regardless of the RD field of
>   received DNS packet,
>   I added the line, "hp->rd = 1;", in the source code* of Bind 8.2.2.
>
>       * dispatch_message(), the function in ns_main.c
>
>   As the result, two cases is working well.
>
>   But, I wonder if this change affects other functions of BIND (Does  it only
>   increase Server B's load ?)

It probably won't have any ill effects other than increasing the server load.
You've faked out RD early enough in the processing loop that the rest of the code
probably won't know the difference.

>   and I'd like to know how to set RD flag in BIND 8.2.2 and another method to
>   resolve my problem.

Why not just get Alteon to fix their product?


- Kevin