Re: Pinging interfaces on same machine and subnet
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Joel Fernandes writes:
I have a question about sending ping requests from one interface to another on the same linux machine .
Hi Joel,if I'm not mistaken you need a kernel patch for that to work. They can be found here: http://www.ssi.bg/~ja/#loop (the Send-To-Self section).
I have 3 virtual interfaces configured to be on the same subnet with IPs / interfaces: 192.168.3.1 (interface is mesh0), 192.168.3.2 (interface is mesh1), 192.168.3.3 (interface is mesh2) But when I try send a ping request from 3.1 to 3.2, its not responsive root@joel-laptop:/usr/src# ping -I mesh0 192.168.3.2 PING 192.168.3.2 (192.168.3.2) from 192.168.3.1 mesh0: 56(84) bytes of data. From 192.168.3.2 icmp_seq=845 Destination Host Unreachable Funny enough, I see this in tcp dump of mesh0 as soon as I run the ping command. root@joel-laptop:/usr/src# tcpdump -i mesh0 listening on mesh0, link-type EN10MB (Ethernet), capture size 96 bytes 21:53:47.938527 ARP, Request who-has joel-laptop.local tell joel-laptop.local, length 28 As the interface is one the same machine and subnet, I'd imagine the machine would know the MAC address of 192.168.3.2 and wouldn't have to send an ARP message. Could anyone explain this behavior and also suggest some way in which the pinging issue could be fixed? Thanks! Joel -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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