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Special Forums IP Networking Pinging IP located on another interface Post 302657275 by NH2 on Sunday 17th of June 2012 03:38:33 AM
Old 06-17-2012
Pinging IP located on another interface

Hi,

I have a rather strange IP question...

Here's my problem:
  • I have a Linux box (call it "turing") with 2 NICs.
  • One network interface (eth0) has an IP assigned, say 192.168.42.50.
  • The other interface (eth1) is up, but has no IP yet.
My question: is it possible to determine from another computer connected to eth1 per ICMP echo request that the IP 192.168.42.50 is already assigned to my box "turing"? IOW:
  • the ICMP Echo request comes from eth1
  • the IP asked in the request is assigned to eth0
  • What I'd want to achieve: turing sends ICMP reply through eth1.
I am not sure if that's make any sense, or is possible...

You may wonder why on the earth I'm trying to solve such a twisted problem... It's a epic story... But in essence that is the problem (shaved to the bone) I need to solve for some new use cases of a system with bad architecture that I can't fix because it would break compatibility with other systems Smilie

Thanks,
/NH2
 

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arpsend(8)							    Containers								arpsend(8)

NAME
arpsend - send ARP requests SYNOPSIS
arpsend -D -e target_ip [ -e target_ip ...] [-c count] [-w timeout] interface arpsend -U -i source_ip [-c count] [-w timeout] interface DESCRIPTION
Utility arpsend sends ARP packets on device interface to detect or update neighbours' ARP caches with a given IP. COMMANDS
Run utility with one of the following commands: -D Send broadcast ARP request to detect neighbours with target_ip. You have to specify target_ip (-e option). -U Send broadcast ARP request to update neighbours' ARP caches with source_ip. You have to specify source_ip (-i option). OPTIONS
-c count Number of packets to send. Default is infinity. -w interval Interval between packets, in seconds. Default is 1 second. -i source_ip_address Set source IP address field in ARP packet. -e target_ip_address Set target IP address field in ARP packet. Note that you can specify -e option multiple times to detect many IP addresses in one utility call. EXIT STATUS
arpsend returns 0 upon successful execution. If something goes wrong, it returns an appropriate error code. 1 EXC_USAGE Usage error 2 EXC_SYSTEM System error 3 EXC_RECV ARP reply was received EXAMPLES
To send request on interface eth0 to detect any neighbour computers with IP 192.168.10.200: arpsend -D -e 192.168.10.200 eth0 To send request on interface eth0 to update neighbours' ARP caches with IP 192.168.10.200: arpsend -U -i 192.168.10.200 eth0 NOTES
Interface you use have to be arpable and not be loopback (i.e. /sbin/ip link show interface should show neither NOARP nor LOOPBACK flags in interface parameters). SEE ALSO
vzctl(8). LICENSE
Copyright (C) 2000-2011, Parallels, Inc. Licensed under GNU GPL. OpenVZ 28 Jun 2011 arpsend(8)
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