headers
Zhangzongjian (Thomas | 11 Jul 2012 05:39
Favicon

Re: comment on draft-li-behave-nat444-test-00, FTP active/passive

Dear Dan
In fact we tested the typical FTP active model as an illustration for the FTP scenarios. In such an example,
the FTP server is in public networks and FTP client is in private network. Thanks for your comments. We will
add the detailed description in the next version.

Thomas
Best regards

-----Original Message-----
From: Dan Wing [mailto:dwing <at> cisco.com] 
Sent: Wednesday, July 11, 2012 8:24 AM
To: draft-li-behave-nat444-test <at> tools.ietf.org; 15301588336 <at> 189.cn; 15306188213 <at> 189.cn;
liuchunlin <at> jsptpd.com; Will Liu (Shucheng); Zhangzongjian (Thomas)
Subject: comment on draft-li-behave-nat444-test-00, FTP active/passive

Hi.

It would be helpful in your FTP test results if you indicated if passive
(PASV) or active mode was tested.

-d
Permalink | Reply |
headers
Will Liu (Shucheng | 11 Jul 2012 10:44
Favicon

Re: comment on draft-li-behave-nat444-test-00, FTP active/passive

Hi,

One thing I would like to add here is, this draft mainly focuses on the diversity of application tested. What
we listed in the draft basically covers almost all the current typical popular applications. By posting
this draft, we are able to show the outline of support situation of CGN for getting vast majority of
applications through NAT, to both network man as well as those who are also interested in network software
development. There might still be some scenarios we have not covered. If anybody is interested in those we
did not mention in our draft, we are appreciated to your comments.

Have a nice day!
Will

-----Original Message-----
From: Zhangzongjian (Thomas) 
Sent: Wednesday, July 11, 2012 11:40 AM
To: Dan Wing; draft-li-behave-nat444-test <at> tools.ietf.org; 15301588336 <at> 189.cn;
15306188213 <at> 189.cn; liuchunlin <at> jsptpd.com; Will Liu (Shucheng)
Cc: behave <at> ietf.org
Subject: RE: comment on draft-li-behave-nat444-test-00, FTP active/passive

Dear Dan
In fact we tested the typical FTP active model as an illustration for the FTP scenarios. In such an example,
the FTP server is in public networks and FTP client is in private network. Thanks for your comments. We will
add the detailed description in the next version.

Thomas
Best regards

-----Original Message-----
From: Dan Wing [mailto:dwing <at> cisco.com]
(Continue reading)

Permalink | Reply |
headers
Reinaldo Penno (repenno | 11 Jul 2012 18:40
Picon
Favicon

Some comments on draft-li-behave-nat444-test-00

Hello,

Some comments on your draft which I believe is interesting.

Most of your tests are subscriber initiated connections which results in
Internet (I) ->subscriber (S) traffic over TCP/UDP. We all know this works
well with CGN. The interesting cases are I/S<->S for gratuitous
connections. In that sense, some comments below.

Is on-line gaming with consoles popular in China? PS3, XBOX, Nintendo?

People do not seed torrents in China? That is very popular in other parts
of the world. 

I would like to understand how the CGN was configured. Were mappings APP
enabled? EIM & EIF? Hairpinning enabled? This, of course is specially
interesting on the I/S<->S scenarios.

As far a VPN goes, the interesting ones from CGN perspective are IPsec
(not over UDP) and PPTP.

Thanks,

- RP

>
>Have a nice day!
>Will
>
>-----Original Message-----
(Continue reading)

Permalink | Reply |
headers
Zhangzongjian (Thomas | 12 Jul 2012 05:55
Favicon

Re: Some comments on draft-li-behave-nat444-test-00

Dear Penno

The answers are online below.

Best regards
thomas

-----Original Message-----
From: Reinaldo Penno (repenno) [mailto:repenno <at> cisco.com] 
Sent: Thursday, July 12, 2012 12:41 AM
To: Will Liu (Shucheng); Zhangzongjian (Thomas); Dan Wing (dwing);
draft-li-behave-nat444-test <at> tools.ietf.org; 15301588336 <at> 189.cn; 15306188213 <at> 189.cn; liuchunlin <at> jsptpd.com
Cc: behave <at> ietf.org
Subject: Some comments on draft-li-behave-nat444-test-00

Hello,

Some comments on your draft which I believe is interesting.

Most of your tests are subscriber initiated connections which results in
Internet (I) ->subscriber (S) traffic over TCP/UDP. We all know this works
well with CGN. The interesting cases are I/S<->S for gratuitous
connections. In that sense, some comments below.

Is on-line gaming with consoles popular in China? PS3, XBOX, Nintendo?
Thomas:
PS3, XBOX, Nintendo is seldom played in China. PS3, XBOX, Nintendo are not published in China and there are
no game servers for these three game in China.

People do not seed torrents in China? That is very popular in other parts
(Continue reading)

Permalink | Reply |
headers
Dan Wing | 11 Jul 2012 17:07
Picon
Favicon

Re: comment on draft-li-behave-nat444-test-00, FTP active/passive

> -----Original Message-----
> From: behave-bounces <at> ietf.org [mailto:behave-bounces <at> ietf.org] On
> Behalf Of Zhangzongjian (Thomas)
> Sent: Tuesday, July 10, 2012 8:40 PM
> To: Dan Wing; draft-li-behave-nat444-test <at> tools.ietf.org;
> 15301588336 <at> 189.cn; 15306188213 <at> 189.cn; liuchunlin <at> jsptpd.com; Will Liu
> (Shucheng)
> Cc: behave <at> ietf.org
> Subject: Re: [BEHAVE] comment on draft-li-behave-nat444-test-00, FTP
> active/passive
> 
> Dear Dan
> In fact we tested the typical FTP active model as an illustration for
> the FTP scenarios.

My statistics show that active FTP is not typical.  Several years ago I
obtained logs from ftp.cisco.com and 99% of our connections were
passive-mode FTP.  It was only one user, downloading several files, that was
using active-mode FTP, and had an IP address belonging to Boeing.  All web
browsers do passive-mode FTP by default or exclusively, including IE 7 and
up, Safari, Firefox, Opera, and Chrome.

Do you have statistics showing a high number of active mode FTP?  Perhaps
this is caused by IE 6, which I know is still used extensively in China, and
defaults to active-mode FTP.  It would be interesting to know how often
active mode FTP is used considering it would also require FTP ALG support in
existing WiFi access points (restaurants, hotels, and airports).

> In such an example, the FTP server is in public
> networks and FTP client is in private network. Thanks for your
(Continue reading)

Permalink | Reply |
headers
Will Liu (Shucheng | 12 Jul 2012 05:10
Favicon

Re: comment on draft-li-behave-nat444-test-00, FTP active/passive

Thanks for sharing your statistics, which is very interesting and also helpful for us. You are correct. As
far as we know, both IE6 and ftp command in DOS (in windows) are using the Active(PORT) mode as the default
mode, which are still widely used in China. However, as IE8/Firefox/chrome and Win7 spread in China in
recent years, more and more FTPs are working under the passive mode. For your question about the number of
active mode FTP, we afraid that we do not have the statistics for the number of active/passive mode.
As I double checked our testing result, it was generated from the default DOS (in windows) ftp command,
under the PASSIVE mode. Just as you mentioned, passive FTP does not need an FTP ALG. That's why I used the
"typical" word. 

I hope my answer is helpful. 

Cheers,
Will

-----Original Message-----
From: Dan Wing [mailto:dwing <at> cisco.com] 
Sent: Wednesday, July 11, 2012 11:08 PM
To: Zhangzongjian (Thomas); draft-li-behave-nat444-test <at> tools.ietf.org; 15301588336 <at> 189.cn;
15306188213 <at> 189.cn; liuchunlin <at> jsptpd.com; Will Liu (Shucheng)
Cc: behave <at> ietf.org
Subject: RE: [BEHAVE] comment on draft-li-behave-nat444-test-00, FTP active/passive

> -----Original Message-----
> From: behave-bounces <at> ietf.org [mailto:behave-bounces <at> ietf.org] On
> Behalf Of Zhangzongjian (Thomas)
> Sent: Tuesday, July 10, 2012 8:40 PM
> To: Dan Wing; draft-li-behave-nat444-test <at> tools.ietf.org;
> 15301588336 <at> 189.cn; 15306188213 <at> 189.cn; liuchunlin <at> jsptpd.com; Will Liu
> (Shucheng)
> Cc: behave <at> ietf.org
(Continue reading)

Permalink | Reply |

Gmane