[sdnog] sdnog Digest, Vol 23, Issue 11

Tue Aug 23 11:13:31 SAST 2016

thanks mr.philip & mr.wadah khalid
but really am distraction about the 2 quires
mr.wadah khalid say it are the same
is this right ??

2016-08-23 12:00 GMT+03:00 <sdnog-request at sdnog.sd>:

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> Today's Topics:
>
>    1. Re: Dns Queries (Philip Paeps)
>    2. Re: DNS Queries (Philip Paeps)
>    3. Re: DNS Queries (wadah khalid)
>    4. Re: DNS Queries (Sahlih Shihab)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 22 Aug 2016 14:08:09 +0200
> From: "Philip Paeps" <philip at trouble.is>
> To: "wadah khalid" <engwada7 at gmail.com>
> Cc: sdnog at sdnog.sd
> Subject: Re: [sdnog] Dns Queries
> Message-ID: <E3B5CB39-9294-4A4E-BFB6-24A61F3C1B47 at trouble.is>
>
> On 2016-08-22 13:18:27 (+0200), wadah khalid <engwada7 at gmail.com> wrote:
>
> > Domain Name System is a multi-transport protocol which means it uses tcp
> > port 53 and udp .
> > regarding to the previous information .
> > when do you think that DNS can be tcp and when it will use udp ? discuss
>
> DNS will run over UDP unless it can't.
>
> Historically, DNS packets over UDP can only be 512 bytes long.  With the
> EDNS0 option, they can be as long as 4096 bytes.  Still not enough for
> zone transfers (AXFR) but long enough for most DNSKEY replies.
>
> Philip
>
> --
> Philip Paeps
> Senior Reality Engineer
> Ministry of Information
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 22 Aug 2016 14:14:05 +0200
> From: "Philip Paeps" <philip at trouble.is>
> To: "wadah khalid" <engwada7 at gmail.com>
> Cc: sdnog at sdnog.sd
> Subject: Re: [sdnog] DNS Queries
> Message-ID: <D0A9AD9A-D386-4C6F-B627-747247C6AB06 at trouble.is>
>
> On 2016-08-22 13:36:35 (+0200), wadah khalid <engwada7 at gmail.com> wrote:
>
> > thank you for your response ..
> > as i know DNS has two operation queries  - (1)recursive query which is
> the
> > operation between the client and server and
> > *(2) iterative query which represents the relation between my server and
> > other DNS servers . *
>
> Both of those queries are identical.
>
> > *i think the recursive is tcp rather than the iterative which is udp ...*
> > *what do you think*
>
> You think wrong.  I would recommend reading section 4.2 of RFC 1035 again.
>
> Philip
>
> --
> Philip Paeps
> Senior Reality Engineer
> Ministry of Information
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 22 Aug 2016 15:32:03 +0300
> From: wadah khalid <engwada7 at gmail.com>
> To: Philip Paeps <philip at trouble.is>
> Cc: sdnog at sdnog.sd
> Subject: Re: [sdnog] DNS Queries
> Message-ID:
>         <CAGcn-0W5u4Nv-P6BoBn_BLscDAaXagRN2UjcVZcNPJqxBOAc=w
> @mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> The IETF RFC 5966 says that :
> Most of DNS operations are UDP
> Recursive server (or forwarder) implementations MUST support TCP
>       so that they do not prevent large responses from a TCP-capable
>       server from reaching its TCP-capable clients.
> ?????? ???/???/???? ?:?? ?? ??? ?? "Philip Paeps" <philip at trouble.is>:
>
> > On 2016-08-22 13:36:35 (+0200), wadah khalid <engwada7 at gmail.com> wrote:
> >
> > > thank you for your response ..
> > > as i know DNS has two operation queries  - (1)recursive query which is
> > the
> > > operation between the client and server and
> > > *(2) iterative query which represents the relation between my server
> and
> > > other DNS servers . *
> >
> > Both of those queries are identical.
> >
> > > *i think the recursive is tcp rather than the iterative which is udp
> ...*
> > > *what do you think*
> >
> > You think wrong.  I would recommend reading section 4.2 of RFC 1035
> again.
> >
> > Philip
> >
> > --
> > Philip Paeps
> > Senior Reality Engineer
> > Ministry of Information
> >
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> ------------------------------
>
> Message: 4
> Date: Mon, 22 Aug 2016 15:40:00 +0300 (EAT)
> From: Sahlih Shihab <salih.shihab at sudren.edu.sd>
> To: wadah khalid <engwada7 at gmail.com>
> Cc: sdnog at sdnog.sd
> Subject: Re: [sdnog] DNS Queries
> Message-ID:
>         <2094313162.9720.1471869600363.JavaMail.zimbra at sudren.edu.sd>
> Content-Type: text/plain; charset="utf-8"
>
> Hi all
>
> I think the DNS use TCP in transaction between dns-master and dns-salve to
> update the zones in dns-slave, am I right?
> Thanks
>
>
> ----- Original Message -----
>
> From: "wadah khalid" <engwada7 at gmail.com>
> To: "Philip Paeps" <philip at trouble.is>
> Cc: sdnog at sdnog.sd
> Sent: Monday, August 22, 2016 3:32:03 PM
> Subject: Re: [sdnog] DNS Queries
>
>
>
>
> The IETF RFC 5966 says that :
> Most of DNS operations are UDP
> Recursive server (or forwarder) implementations MUST support TCP
> so that they do not prevent large responses from a TCP-capable
> server from reaching its TCP-capable clients.
> ?????? ???/???/???? ?:?? ?? ??? ?? "Philip Paeps" < philip at trouble.is >:
>
>
> On 2016-08-22 13:36:35 (+0200), wadah khalid < engwada7 at gmail.com > wrote:
>
> > thank you for your response ..
> > as i know DNS has two operation queries - (1)recursive query which is the
> > operation between the client and server and
> > *(2) iterative query which represents the relation between my server and
> > other DNS servers . *
>
> Both of those queries are identical.
>
> > *i think the recursive is tcp rather than the iterative which is udp ...*
> > *what do you think*
>
> You think wrong. I would recommend reading section 4.2 of RFC 1035 again.
>
> Philip
>
> --
> Philip Paeps
> Senior Reality Engineer
> Ministry of Information
>
>
>
>
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>
> Salih S. M. Abdelhameed | Head of Electronics Service Unit
> Sudanese Research and Education Network | Address
> Nile St. | University of Khartoum
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