topic Re: Ping sweep / range of IPs in the same subnet in Data Center (VDX)

Ping sweep / range of IPs in the same subnet

Russ — Tue, 02 Jun 2020 13:41:31 GMT

Hi, how can I ping a subnet or run a file (script) that has all the ip’s I need to ping. On some Cisco devices there is the extended ping where you can ping an entire subnet, or even run a script which would run each command sequentially but I can’t see a like option on a VDX6740T.

Re: Ping sweep / range of IPs in the same subnet

Michael_Morey — Tue, 02 Jun 2020 19:55:33 GMT

Russ,

I am not aware of any PING Sweep feature built directly into NOS, however the VDX platform is built on Linux and you can accomplish this via a simple script.

for i in $(seq 1 254); do ping -c1 192.168.11.$i; done

This will ping every IP 1-254 in the subnet 192.168.11.0 one time.

I hope this helps accomplish your goal.

Thanks,

Michael Morey
Principal Technical Support Engineer / Extreme Networks

Re: Ping sweep / range of IPs in the same subnet

Russ — Wed, 03 Jun 2020 06:08:23 GMT

Thanks Michael this looks like a very good workaround and would solve my problem.

I need to include a vrf in the command, so it would look something like this? As for logging is as root, I’ve not done that before (new to this platform), it’s as simple as ssh’g to the device and using root credentials?

for i in $(seq 1 254); do ping 192.168.1.$i -c1 vrf vrf_name; done

Re: Ping sweep / range of IPs in the same subnet

Michael_Morey — Wed, 03 Jun 2020 20:51:55 GMT

As for logging is as root, I’ve not done that before (new to this platform), it’s as simple as ssh’g to the device and using root credentials?

Yes, simply login remotely and provide the root credentials to login.

I need to include a vrf in the command, so it would look something like this?

for i in $(seq 1 254); do ping 192.168.1.$i -c1 vrf vrf_name; done

This is a little more complicated. By default when you login as root, you are in the VRF “mgmt-vrf”. In the PING utility there is no option for “vrf vrf_name”, however you can use the -F flag and use the VRFid Number to send a ping across a different VRF. To check the VRF Name <> Number mapping do the following:

VDX1:FID128:root> noscli

Static-Lab-SM08_VDX1# show vrf
Total number of VRFs configured: 3
VrfName                          VrfId  V4-Ucast  V6-Ucast  
default-vrf                      1      Enabled   Enabled  
mgmt-vrf                         0      Enabled   Enabled  
orange                           2      Enabled     -      

VDX1# exit

VDX1:FID128:root> ping 3.0.0.2 -F 1 
PING 3.0.0.2 (3.0.0.2): 56 data bytes
64 bytes from 3.0.0.2: icmp_seq=0 ttl=64 time=1.460 ms
64 bytes from 3.0.0.2: icmp_seq=1 ttl=64 time=1.420 ms
64 bytes from 3.0.0.2: icmp_seq=2 ttl=64 time=1.395 ms
64 bytes from 3.0.0.2: icmp_seq=3 ttl=64 time=1.397 ms
64 bytes from 3.0.0.2: icmp_seq=4 ttl=64 time=1.566 ms
^C--- 3.0.0.2 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.395/1.448/1.566/0.064 ms

Without specifying the VRF number, ping fails:

VDX1:FID128:root> ping 3.0.0.2
PING 3.0.0.2 (3.0.0.2): 56 data bytes
^C--- 3.0.0.2 ping statistics ---
5 packets transmitted, 0 packets received, 100% packet loss

So all together the command would look like:

for i in $(seq 1 254); do ping 192.168.1.$i -c1 -F VRF_ID_NUMBER; done

Re: Ping sweep / range of IPs in the same subnet

Russ — Thu, 04 Jun 2020 05:37:58 GMT

Thanks again Michael - I’ve inherited these switches where documenting accounts is an after thought. What’s the default root user password. do you know?

Re: Ping sweep / range of IPs in the same subnet

Russ — Mon, 24 Oct 2022 03:47:14 GMT

Hi, How can I get into the noscli? I know how to enter the foscmd, but doesn't appear to give the same interface/option.

What about python? I've taken a brief look at the python CLI, tried to built a script, but bc there's no documentation (at least I can find) on how to drive python on these switches I come up empty!