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I have two computers, let's call them A (192.168.0.10) and B (192.168.0.11). I want A to ping B. However, A cannot ping B unless B pings A first.

# computer A
$ ping 192.168.0.11
# result: Destination Host Unreachable

# computer B
$ ping 192.168.0.10
# result: works
# 64 bytes from 192.168.0.10: icmp_seq=20 ttl=64 time=1.76 ms

# computer A (after computer B pinged A)
$ ping 192.168.0.11
# result: works
# 64 bytes from 192.168.0.11: icmp_seq=1 ttl=64 time=2.65 ms

Do you have any idea what happens? Because of this behavior I cannot ssh the computer before B pinged for example.

This happens in my WLAN.

silgon
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  • Is this over some sort of VPN? – DerfK Sep 26 '17 at 22:55
  • It happens in my local network. No VPN configured. – silgon Sep 27 '17 at 07:34
  • Can you show the state of the ARP table on computer A, before and after the ping ? (arp -a) – b0fh Sep 27 '17 at 07:50
  • @b0fh it is kind of hard to replicate. I restarted twice both computers and It works. However, I know that this problem comes from time to time and the only solution (till now) it is to ping from B to A. :/ – silgon Sep 27 '17 at 17:38

1 Answers1

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Your network could be configured to do so. Read Cannot ping over LAN until a ping is received on ServerFault.

Lakshmikant Deshpande
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  • Hello! The right way to do this is suggest closing as a duplicate of the linked question. If you can't do that due to being new, maybe just leave a comment with the link? – Bill Weiss Sep 28 '17 at 23:18
  • Okay. Thanks Bill, I will take care next time. Unlike StackOverflow, I don't have comment rights here. I think the rights should be shared across the StackExchange network. – Lakshmikant Deshpande Sep 29 '17 at 06:23
  • Oh, right! I forgot that commenting rights come later. Sorry about that! – Bill Weiss Sep 29 '17 at 22:19