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

[Prasad Tadi]

Hi,

I am not really an expert, but I think the "Local link" may use Loop back, instead of actually testing the Network / IPv6 stack.
I have requested my network guru (james)  to look at it.  We are going to try with new OS also and will update. Here is some info for clarity...


James says...
Link-local is the fe80 addresses that refer to devices on a particular data link, such as a single Ethernet network, or a point-to-point serial connection.  If you're using your own link-local address, then yes, that traffic will - I believe - traverse the loopback interface.
I've downloaded the beta version of Ubuntu 9 but haven't yet installed it.  I've also got the most recent kernel source but keep running out of space trying to get it built and installed.
=======

Yes, I have tried earlier with locallink. It works fine.

here is my network info.
root at cspf1:~# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:50:56:b5:24:d9
          inet addr:172.16.109.90  Bcast:172.16.0.0  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:feb5:24d9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3640571 errors:0 dropped:0 overruns:0 frame:0
          TX packets:639330 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1420069146 (1.3 GB)  TX bytes:194595857 (185.5 MB)
          Base address:0x1070 Memory:f4820000-f4840000

eth1      Link encap:Ethernet  HWaddr 00:50:56:b5:52:c1
          inet6 addr: fdf8:c879:493e:1:250:56ff:feb5:52c1/64 Scope:Global
          inet6 addr: fe80::250:56ff:feb5:52c1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3755999 errors:0 dropped:0 overruns:0 frame:0
          TX packets:146318 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:588116930 (560.8 MB)  TX bytes:37499108 (35.7 MB)
          Base address:0x1078 Memory:f4840000-f4860000


root at cspf1:~#  scp /ifs/qa/Package/cc/Hunter/branch/build-6634/desktone.tar 172.16.109.90:/tmp
The authenticity of host '172.16.109.90 (172.16.109.90)' can't be established.
RSA key fingerprint is 39:5c:3d:5d:e4:08:16:d1:0e:6e:36:f1:c4:bd:f8:b5.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.16.109.90' (RSA) to the list of known hosts.
root at 172.16.109.90's password:
desktone.tar                                                                                               100%   71MB  35.3MB/s   00:02

NOW with IPv6 of eth1 network card....

scp -6 /ifs/qa/Package/cc/Hunter/branch/build-6634/desktone.tar [fdf8:c879:493e:1:250:56ff:feb5:52c1]:/tmp
root at fdf8:c879:493e:1:250:56ff:feb5:52c1's password:
desktone.tar                                                                                               100%   71MB  35.3MB/s   00:02
root at cspf1:~#

Following is the IPv6 address of the next node.

I have taken different snapshots for the IPv6 failure to get some good idea.
scp -6 /ifs/qa/Package/cc/Hunter/branch/build-6634/desktone.tar [fdf8:c879:493e:1:250:56ff:feb5:68c5]:/tmp
root at fdf8:c879:493e:1:250:56ff:feb5:68c5's password:
desktone.tar                                                                                                 2% 2112KB   2.1MB/s   00:33 ETA
desktone.tar                                                                                                 2% 2112KB   1.7MB/s   00:41 ETA
desktone.tar                                                                                                 2% 2112KB   1.5MB/s   00:45 ETA
desktone.tar                                                                                                 2% 2112KB   1.1MB/s - stalled -
desktone.tar                                                                                                 3% 2208KB 826.0KB/s   01:24 ETA
desktone.tar                                                                                                 3% 2208KB 602.2KB/s - stalled -
desktone.tar                                                                                                 3% 2304KB 404.7KB/s   02:53 ETA
desktone.tar                                                                                                 3% 2304KB 295.0KB/s   03:57 ETA
desktone.tar                                                                                                 3% 2304KB 193.6KB/s - stalled -
desktone.tar                                                                                                 3% 2432KB 138.5KB/s   08:24 ETA
desktone.tar                                                                                                 3% 2432KB 101.0KB/s   11:32 ETA
desktone.tar                                                                                                 3% 2432KB  73.6KB/s - stalled -
desktone.tar                                                                                                 3% 2560KB  65.2KB/s   17:50 ETA
desktone.tar                                                                                                 3% 2560KB  42.8KB/s - stalled -
desktone.tar                                                                                                 3% 2688KB  40.9KB/s   28:24 ETA
desktone.tar                                                                                                 3% 2688KB  29.8KB/s   38:58 ETAroot at cspf1:~#

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