Hi Sakra,
When I use the Tunnel on a remote machine with multiple IP addresses, it seems that the links are only partially connected.
Here are the details:
The machine on which the remote kernel is running on has multiple IP addresses:
204.90.40.21
172.17.40.21
104.141.1.34
and only IP address 204.90.40.21 is the public IP address that I can ssh to. When I try using Tunnel to start a remote (main) kernel, it shows only two of the six links are established. Here are the ports on the remote machine for the kernel:
[mwu3@smic1 ssh]$ lsof -i 4 -a
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
MathKerne 29666 mwu3 4u IPv4 33257804 0t0 TCP localhost.localdomain:59040->localhost.localdomain:51676 (ESTABLISHED)
MathKerne 29666 mwu3 5u IPv4 33257801 0t0 TCP localhost.localdomain:60247->localhost.localdomain:51675 (ESTABLISHED)
[mwu3@smic1 ssh]$
And ports on my local machine for the frontend are:
ssh 1324 xslittlegrass 3u IPv4 0xc9651f6c7f393a47 0t0 TCP mwu3-2.lsu.edu:50961->smic1.hpc.lsu.edu:ssh (ESTABLISHED)
Mathemati 1798 xslittlegrass 36u IPv4 0xc9651f6c6a728317 0t0 TCP localhost:51474->localhost:51475 (ESTABLISHED)
Mathemati 1798 xslittlegrass 48u IPv4 0xc9651f6c7f90ba47 0t0 TCP localhost:51675->localhost:51681 (ESTABLISHED)
Mathemati 1798 xslittlegrass 49u IPv4 0xc9651f6c6a21b4b7 0t0 TCP localhost:51676->localhost:51682 (ESTABLISHED)
Mathemati 1798 xslittlegrass 81u IPv4 0xc9651f6c7f531657 0t0 TCP localhost:51480->localhost:51478 (ESTABLISHED)
Mathemati 1798 xslittlegrass 101u IPv4 0xc9651f6c6a244d87 0t0 TCP localhost:51481->localhost:51479 (ESTABLISHED)
MathKerne 1802 xslittlegrass 22u IPv4 0xc9651f6c7f4e2be7 0t0 TCP localhost:51475->localhost:51474 (ESTABLISHED)
MathKerne 1802 xslittlegrass 36u IPv4 0xc9651f6c7fa3ed87 0t0 TCP localhost:51478->localhost:51480 (ESTABLISHED)
MathKerne 1802 xslittlegrass 50u IPv4 0xc9651f6c7f391f27 0t0 TCP localhost:51479->localhost:51481 (ESTABLISHED)
bash 2053 xslittlegrass 36u IPv4 0xc9651f6c6a728317 0t0 TCP localhost:51474->localhost:51475 (ESTABLISHED)
bash 2053 xslittlegrass 48u IPv4 0xc9651f6c7f8660c7 0t0 TCP localhost:51675 (LISTEN)
bash 2053 xslittlegrass 49u IPv4 0xc9651f6c7f864657 0t0 TCP localhost:51676 (LISTEN)
bash 2053 xslittlegrass 81u IPv4 0xc9651f6c7f531657 0t0 TCP localhost:51480->localhost:51478 (ESTABLISHED)
bash 2053 xslittlegrass 101u IPv4 0xc9651f6c6a244d87 0t0 TCP localhost:51481->localhost:51479 (ESTABLISHED)
ssh 2085 xslittlegrass 3u IPv4 0xc9651f6c69e2f317 0t0 TCP mwu3-2.lsu.edu:51677->smic1.hpc.lsu.edu:ssh (ESTABLISHED)
ssh 2085 xslittlegrass 7u IPv4 0xc9651f6c7f4e3d87 0t0 TCP localhost:51677 (LISTEN)
ssh 2085 xslittlegrass 9u IPv4 0xc9651f6c6a245657 0t0 TCP localhost:51678 (LISTEN)
ssh 2085 xslittlegrass 11u IPv4 0xc9651f6c6a1faa47 0t0 TCP localhost:51679 (LISTEN)
ssh 2085 xslittlegrass 13u IPv4 0xc9651f6c698e1d87 0t0 TCP localhost:51680 (LISTEN)
ssh 2085 xslittlegrass 14u IPv4 0xc9651f6c6a245f27 0t0 TCP localhost:51681->localhost:51675 (ESTABLISHED)
ssh 2085 xslittlegrass 17u IPv4 0xc9651f6c68174be7 0t0 TCP localhost:51682->localhost:51676 (ESTABLISHED)
We can see that four links at ports 51677-51680 are not established.
This partial connection results of no graphics nor code highlight in Mathematica, and the frontend acts like a terminal for the kernel:
I'm not sure whether this is because ssh is set to forward the port on the wrong interface. In tunnel, the ssh is set to forward the port on 127.0.0.1, but I'm not sure which IP address ssh will select from. I see that in the package, it can choose the right IP address for subkernels, so multiple IP address will not cause problems for subkernels. But here the problem is at the main kernel.
Any idea how to solve this?
Update
It looks like the ssh port forwarding works fine. I can create six links without problem mannully between local and remote kernels:
I start the ssh port forwarding first using
ssh -R 52848:127.0.0.1:52848 -R 52849:127.0.0.1:52849 -L 52850:127.0.0.1:52850 -L 52851:127.0.0.1:52851 -L 52852:127.0.0.1:52852 -L 52853:127.0.0.1:52853 smic
Local:
In[1]:= linkToRemote1=LinkCreate["[email protected],[email protected]",LinkProtocol->"TCPIP"]
Out[1]= LinkObject[[email protected],[email protected], 62, 1]
In[2]:= linkToRemote2=LinkConnect["[email protected],[email protected]",LinkProtocol->"TCPIP"]
Out[2]= LinkObject[[email protected],[email protected], 63, 2]
In[3]:= linkToRemote3=LinkConnect["[email protected],[email protected]",LinkProtocol->"TCPIP"]
Out[3]= LinkObject[[email protected],[email protected], 64, 3]
In[4]:= LinkWrite[linkToRemote1,"hello 1"]
In[5]:= LinkWrite[linkToRemote2,"hello 2"]
In[6]:= LinkWrite[linkToRemote3,"hello 3"]
Remote:
In[1]:= linkToLocal1=LinkConnect["[email protected],[email protected]",LinkProtocol->"TCPIP"]
Out[1]= LinkObject[[email protected],[email protected], 60, 1]
In[2]:= linkToLocal2=LinkCreate["[email protected],[email protected]",LinkProtocol->"TCPIP"]
Out[2]= LinkObject[[email protected],[email protected], 61, 2]
In[3]:= linkToLocal3=LinkCreate["[email protected],[email protected]",LinkProtocol->"TCPIP"]
Out[3]= LinkObject[[email protected],[email protected], 62, 3]
In[4]:= LinkRead[linkToLocal1]
Out[4]= hello 1
In[5]:= LinkRead[linkToLocal2]
Out[5]= hello 2
In[6]:= LinkRead[linkToLocal3]
Out[6]= hello 3
And I think Szabolcs may have had the same probem
http://forums.wolfram.com/mathgroup/archive/2011/Jun/msg00283.html
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