In my local homenet I have the the five PCs: lynx, grizzly, condor, thinkpad (only over WLAN), vilm and the WLAN router: ap2. With ping all IP addresses are seen from all IPs (with except for ap2). In the past I got the same result with arping. Now arping fails for several pairs: lynx does not see with arping grizzly and thinkpad, grizzly does not see with arping thinkpad and vilm, condor does not see with arping grizzly and vilm thinkpad does not see grizzly and vilm vilm doesn not see grizzly and thinkpad Any idea what could be the reason? Reproducible: Always
Created attachment 244183 [details] list of all pairwise tests
If I display the ARP cache, I can see all hosts in the neighborhood. But nevertheless arping can;t find some of them: root@lynx:/root(24)# arp | grep "grizzly\|condor" condor.homenet ether 00:1a:92:e0:24:46 C br0 grizzly.homenet ether 00:0f:ea:e1:65:1b C br0 root@lynx:/root(25)# arping -c2 -Ibr0 condor ARPING 192.168.1.76 from 192.168.1.33 br0 Unicast reply from 192.168.1.76 [00:1A:92:E0:24:46] 0.786ms Unicast reply from 192.168.1.76 [00:1A:92:E0:24:46] 0.798ms Sent 2 probes (1 broadcast(s)) Received 2 response(s) root@lynx:/root(26)# arping -c2 -Ibr0 grizzly ARPING 192.168.1.53 from 192.168.1.33 br0 Sent 2 probes (2 broadcast(s)) Received 0 response(s)
The same here. Why this is RESOLVED? I see hosts in arp table, but when using arping they are not available. Actually, they are available, but I must wait several seconds before ping results are printed on the screen. Several pings are lost, then it's working fine. There's no problem for some hosts. # uname -a Linux heros.altec.pl 2.6.31-gentoo-r6 #1 SMP Fri Dec 11 09:47:04 CET 2009 x86_64 Intel(R) Xeon(R) CPU 5130 @ 2.00GHz GenuineIntel GNU/Linux
BTW, the arping from net-analyzer/arping works as expected: root@condor:/usr/local/portage/sci-misc(70)# arping2 -c2 -Ibr0 grizzly ARPING 192.168.1.53 60 bytes from 00:0f:ea:e1:65:1b (192.168.1.53): index=0 time=198.126 usec 60 bytes from 00:0f:ea:e1:65:1b (192.168.1.53): index=1 time=199.080 usec --- 192.168.1.53 statistics --- 2 packets transmitted, 2 packets received, 0% unanswered root@condor:/usr/local/portage/sci-misc(71)# arping -c2 -Ibr0 grizzly ARPING 192.168.1.53 from 192.168.1.76 br0 Sent 2 probes (2 broadcast(s)) Received 0 response(s) root@condor:/usr/local/portage/sci-misc(73)# ping -c2 grizzly PING grizzly.homenet (192.168.1.53) 56(84) bytes of data. 64 bytes from grizzly.homenet (192.168.1.53): icmp_req=1 ttl=64 time=0.261 ms 64 bytes from grizzly.homenet (192.168.1.53): icmp_req=2 ttl=64 time=0.220 ms --- grizzly.homenet ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 0.220/0.240/0.261/0.025 ms
Fixed here http://bugs.gentoo.org/show_bug.cgi?id=337049
Thanks Aleksander. arping seems to work again.
