#Additional network troubleshooting tools

1 messages · Page 1 of 1 (latest)

digital yarrow
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Additional common network tools for the ONTAP cli. Specifially a tool to check for open ports.

tulip surge
novel iris
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@digital yarrow Can you provide some specific examples of when this is needed? Systemshell has some options as noted, but it would be ideal to understand the use-case(s)

sour flare
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There's a lot of use cases - common one I run into is checking if SnapMirror ports are open across a network or not, especially from a specific LIF if there are multiple networks/VLANs in play.

I haven't used the systemshell telnet client in a bit but I don't recall being able to select what LIF to initiate the connection from.

I was wrong on this - see below

plucky pagoda
sour flare
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--edited - removed this to clear up the conversation

plucky pagoda
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Oh sorry, I guess I didn't read the entire message 😕

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I second the use case!

sour flare
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So it looks like I was wrong.

Here's the source IC LIFs on my primary cluster:
`
mn1-ontap1::*> net int show -role intercluster
(network interface show)
Logical Status Network Current Current Is
Vserver Interface Admin/Oper Address/Mask Node Port Home

mn1-ontap1
iclif1 up/up 10.0.4.58/24 mn1-ontap1-01 a0a-4 true
iclif2 up/up 10.0.4.59/24 mn1-ontap1-02 a0a-4 true
2 entries were displayed.

mn1-ontap1::*> `

Here's the IC LIFs on my secondary cluster:

`mn101-ontap101a::> net int show -role intercluster
(network interface show)
Logical Status Network Current Current Is
Vserver Interface Admin/Oper Address/Mask Node Port Home

mn101-ontap101a
ontap101a-iclif1 up/up 10.0.4.68/24 mn101-ontap101a-01 e0b true
ontap101a-iclif2 up/up 10.0.4.69/24 mn101-ontap101a-01 e0c true
2 entries were displayed.

mn101-ontap101a::>`

You can specify a source address in the telnet systemshell command:

mn1-ontap1-01% telnet -h telnet: illegal option -- h usage: telnet [-4] [-6] [-8] [-B baudrate] [-E] [-K] [-L] [-N] [-S tos] [-X atype] [-c] [-d] [-e char] [-k realm] [-l user] [-f/-F] [-n tracefile] [-r] [-s src_addr] [-u] [-P policy] [-y] [host-name [port]] mn1-ontap1-01%

and testing a telnet to one of the snapmirror ports works, the -s being my source IP address:

mn1-ontap1-01% telnet -s 10.0.4.58 10.0.4.68 11104 Trying 10.0.4.68... Connected to 10.0.4.68. ^C ^CConnection closed by foreign host. mn1-ontap1-01%

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In the above output, the LIF needed to be owned or at least currently present on the node that you picked for systemshell. You can use 'ifconfig' in systemshell to get a list of inet addresses you can use as the source.

I maintain It would still be helpful to have this built into the ONTAP command line instead of dropping into systemshell, but at least there's some potential workarounds in the meantime

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@plucky pagoda this might be helpful?

plucky pagoda
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Very nice! Thank you so much!

plucky pagoda
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Just tried this and it doesn't seem to be possible using SVM LIF's.
bind: Can't assign requested address

tulip surge
plucky pagoda
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I intepreted Joels post as an example of what could be done with telnet from systemshell, but I understand now that it only applies to this particular use case and not in the general idea that this Feature request was created with.

sour flare
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Interesting, I'd thought this would work for LIFs owned by data SVMs but yeah it seems to fail to assume any address not owned by the cluster-named SVM