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
Thanks,
/NH2
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LEARN ABOUT DEBIAN
arpsend
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)