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Rich M
Asked: 2018-01-24 06:54:05 +0800 CST

Unable to locate switch on network

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I have a HP 2530-8G on the network which we cannot log in to as we do not know the management IP address. The MAC address does not appear in any of the DHCP leases so I would assume it is using a static IP. Nor does it appear in any IP scans (e.g. Angry IP) and from another switch of the same model, I cannot see any way to hide it from ICMP requests. Attempts to connect via the management ports have also resulted in failure. The Micro USB connection requires the use of a terminal emulator (such as KiTTY) but all attempts have failed and I do not have a laptop with a serial port.

So, I cannot find its MAC address anywhere I look nor can I find the IP address. How do I connect to the management interface to find out how this switch is configured?

Thanks is advance.

networking

2 Answers

  1. Alternatively:

    1. The 2530 series have a USB console port - connect a terminal, log in and run show ip.
    2. On a computer connected directly to the switch, run a packet capture and look for LLDP packets. You should also be able to see the info from another switch supporting LLDP. (HP: show lldp info remote) By default, the 2530 announces itself every 30 s. The LLDP info includes the local management address.

    On Windows, you can do a quick ARP scan running this script. It expects a parameter like 192.168.0 to scan 192.168.0.x.

    @echo off
for /l %%i in (1,1,254) do (
  ping -n 1 -w 0 %1.%%i >nul
  arp -a %1.%%i|find "dynami"
)
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  2. There are multiple ways to find the IP of the device.

    Either you can use a tool like arp-scan to find all IP addresses in a range or you could start a packet capture, for example with wireshark, plug in and look at the ARP broadcasts.

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