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Accepted
Moritz von Schweinitz
Asked: 2018-08-30 12:51:30 +0800 CST

Can't ping 253.100.156.93 from Linux

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At a remote location, there is a chinese ethernet enabled POS printer.

It somehow garbled it's configuration, and its self-test now says that its IP address is 253.100.156.93, (which is inside a IANA reserved block)

No biggie, I thought - I will just ifconfig eth0 add 253.100.156.92 and log into the printer's config panel and reset the IP.

Strangely, after adding that IP address, ifconfig still doesn't show it.

ip a does, though:

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:27:0e:1d:07:ed brd ff:ff:ff:ff:ff:ff
    inet 192.168.209.99/16 brd 192.168.255.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 253.100.156.92/32 scope global eth0
       valid_lft forever preferred_lft forever

but i still can't ping or visit 253.100.156.93.

Is there something I am missing? Why does ifconfig not show that address, but ip a does? Is there some built-in filtering of reserved IANA addresses in the kernel?

routing

1 Answers

  1. Best Answer

    You should not use ifconfig, as you see it can't display multiple IP addresses.

    Your problem is visible in the output of ip a: 253.100.156.92/32

    Delete that address and add it with mask /24.

    ip a del 253.100.156.92/32 dev eth0
ip a add 253.100.156.92/24 dev eth0
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