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XROOTD-L  May 2014

XROOTD-L May 2014

Subject:

Re: xrootd 4.0.0rc3 and IPv6

From:

Ulf Tigerstedt <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Wed, 28 May 2014 11:37:32 +0300

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (114 lines)

On 28/05/14 09:24, Andrew Hanushevsky wrote:
> Hi Ulf,
>
> On Wed, 28 May 2014, Ulf Tigerstedt wrote:
>
>> The specs says the IPv6 address should be returned in place of
>> aaa.bbb.ccc.ddd, not in place of ::aaa.bbb.ccc.ddd.
>
>> Since I'm the tester of the other implementation of the xrootd server,
>> the devil is truly in the details.. and we are currently contemplating
>> follwing a confusing spec or making it bug-compatible with the
>> original documentation. Fixing the spec would be better.
> I will change it to be very clear that either an IPV4 mapped IPV6 address,
>   an IPv6 address, or hostname is returned.

Thanks!

> OK, so you are using a "server" that has a registered IPv4 address but
> there is nothing there to indicate that it has an IPv6 address other
> than just "knowing" this is the case. I'm not suprised that this could
> cause inconsistencies. Have you tried repeating this with the machine
> getting a real AAAA record into its DNS entry?
>
>   > I then contact it:
>> ./xrdfs [2001:708:10:0:7ae7:d1ff:fe24:11b9]
>> [[2001:708:10:0:7ae7:d1ff:fe24:11b9]:1094] / > cd /tmp
>> [[2001:708:10:0:7ae7:d1ff:fe24:11b9]:1094] /tmp > ls
>> /tmp/.ICE-unix
>> /tmp/.xrootd
>> /tmp/ssh-wKaMS12947
>> <more files>
>>
>> However, this is where it goes wrong: (log from xrootd)
>> 140528 07:56:23 21452 XrootdXeq:
>> csculf.21457:21@[2001:708:10:0:7ae7:d1ff:fe24:11b9] pub IPv6 login
>> 140528 07:56:23 21368 XrootdXeq: csculf.21457:22@aesyle pub IPv4 login
> The case here is that the new client actually logs in twice for
> directory listings. It would appear that the firt login used the IPv6
> address and hence was recognized as an IPv6 client. The second login
> used the IPv4 address and so the client was considered to be an IPv4
> client.

Yes, since it uses the response from kXr_locate, which is always IPv4.



>
> Anyway, our attempt here was to provide backward compatability to the
> old client that only knew how to process IPv4 mapped responses. We may
> have taken that to a bit of an extreme and we will look into that. That
> said, it would still be useful to see a) the debug output of the server
> for locate, and b) what happens when the server's IPv6 address is
> actually in DNS.

Ok, test server moved to usva.fgi.csc.fi which has IPv6 + IPv4 and the 
firewall also now open. No difference:

./xrootd -d
<snip a lot>

140528 11:14:17 23292 XrdSched: running 
csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] inq=0
140528 11:14:17 23292 csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] 
XrootdProtocol: 0100 req=3027 dlen=5
140528 11:14:17 23292 csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] 
XrootdProtocol: 0100 locate  */tmp
140528 11:14:17 23292 csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] 
ofs_fsctl:  fn=*/tmp
140528 11:14:17 23292 csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] 
XrootdProtocol: 0100 rc=-1024 locate */tmp
140528 11:14:17 23292 csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] 
XrootdResponse: 0100 sending 25 data bytes
140528 11:14:17 23291 XrdSched: running csculf.2905:22@aesyle inq=0
140528 11:14:17 23291 csculf.2905:22@aesyle XrootdProtocol: 0100 
req=3004 dlen=4
140528 11:14:17 23291 csculf.2905:22@aesyle ofs_opendir:  fn=/tmp
140528 11:14:17 23291 csculf.2905:22@aesyle oss_Opendir: lcl path /tmp 
(/tmp)
140528 11:14:17 23291 csculf.2905:22@aesyle XrootdResponse: 0100 sending 
487 data bytes
140528 11:14:17 23291 csculf.2905:22@aesyle ofs_closedir:  fn=/tmp
140528 11:14:17 23291 csculf.2905:22@aesyle XrootdProtocol: 0100 dirlist 
entries=35 path=/tmp
140528 11:14:20 23292 csculf.2905:19@[2001:708:10:0:7ae7:d1ff:fe24:11b9] 
XrootdProtocol: 0100 request timeout; read 0 of 24 bytes

a tcpdump on aesyle shows that the first handshake (up until kXr_locate) 
is on IPv6, then it switches to IPv4 for the rest.

Here aesyle is the client (still without AAAA record, and usva is the 
server)

Full debug output from xrootd is available from:

xrootd://[2001:708:10:30:5652:ff:fe05:99e5]:1094/tmp/out   (or 
usva.fgi.csc.fi)





-- 
Ulf Tigerstedt || CSC Oy || NDGF
Computing Environments group
(NGI_FI and NGI_NDGF) deputy manager
GSM +358503818558 || +35894572279
Keilaranta 14 || Espoo || Finland

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