[Bug 352841] [NEW] SCP over IPv6 address is very Slow. Takes Hours

[Prasad Tadi]

Public bug reported:

Binary package hint: openssh-server

Hi,

I am using Ubutu Hardy release 8.04 and openssh 4.7P1


lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 8.04.1
Release:        8.04
Codename:       hardy
root at htaf1:~#
OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007


When I copy a 50+ MB file from one system to another  Ubuntu 

Using IPv4 address  it took just less than 3 sec.
Same thing over IPv6 took more than an hour ( 1 Hr and 20 Min) 

I copied the file using local IPv6 address. It ran fine. May be it is
using loop back, instead of real IPv6 address


When I initiate the same from a free BSD box to BSD It took less than 3 sec on both Ipv4 and IPv6.
I can also copy from Ubuntu to a FreeBSD box faster both Ipv4 and IPv6 addreses.

I just can't copy the same from a Ubutu to Ubutu or other machines to
Ubuntu over IPv6 address.

It is very critical for our product :-(

I even tried getting the latest OpenSSH package from openssh.org and compiled that module and ran that sshd.
Still no use. Same old behaviour.

It starts negotiating at 1.5 Mb/ sec and slowly drops to few KB / sec
and stalls the copy process during the time.

Any updates or known issues.

thanks in advance for your information on this issue.

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

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SCP over IPv6 address is very Slow. Takes Hours
https://bugs.launchpad.net/bugs/352841
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