Ping working in one direction only
I have a simple three node wireless linux network as follows:
hostname IP notes crs 192.168.0.101 laptop cuda-host 192.168.0.100 desktop 192.168.0.103 wireless router ethernetted to WIFI modem /etc/hosts on crs and cuda-host look like: ---> 127.0.0.1 localhost 127.0.1.1 crs -or- cuda-host 192.168.0.101 crs 192.168.0.100 cuda-host <--- From crs I can ping (and ssh) cuda-host but from cuda-host I can't ping (or ssh) crs. Instead I get: ---> craig@cuda-host:~$ ping crs PING crs (192.168.0.101) 56(84) bytes of data. From cuda-host (192.168.0.100) icmp_seq=1 Destination Host Unreachable From cuda-host (192.168.0.100) icmp_seq=2 Destination Host Unreachable From cuda-host (192.168.0.100) icmp_seq=3 Destination Host Unreachable <---- doing arp-scan from cuda-host I don't see crs. What I get is: ----> craig@cuda-host:~$ sudo arp-scan -I wlan0 -l Interface: wlan0, datalink type: EN10MB (Ethernet) Starting arp-scan 1.8.1 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/) 192.168.0.1 1c:af:f7:cc:85:cb D-LINK INTERNATIONAL PTE LIMITED 192.168.0.103 50:63:13:c1:7d:f5 Hon Hai Precision Ind. Co.,Ltd. 2 packets received by filter, 0 packets dropped by kernel Ending arp-scan 1.8.1: 256 hosts scanned in 1.781 seconds (143.74 hosts/sec). 2 responded <----- D-LINK is my wireless modem. I thought .103 was my wireless modem. have never heard of the company Hon Hai. Arp-scan looks similar on crs Any idea what's going on here? Thanks, Craig |
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It's good to have the 192.168.x network in /etc/hosts (Uf the IPs are static) but I would not list a box by it's ip and 127.0.0.1. Hosts is for other boxes. There are 3 boxes, so three lines in /etc/hosts 127.0.0.1 line router line other box line (crs on cuda-host; cuda-host on crs) |
Ping is a two way test. It proved what you wanted to know in the first test. That being a connection. The things that could stop it are the ability to offer or accept icmp. That could include the host, client or any device in between or firewalls or ports.
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