Pinging IP located on another interface Post: 302657275

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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

06-17-2012

Registered User

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

NH2

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LEARN ABOUT DEBIAN

vde_tunctl

VDE_TUNCTL(8)						      System Manager's Manual						     VDE_TUNCTL(8)

NAME

       vde_tunctl -- create and manage persistent TUN/TAP interfaces

SYNOPSIS

       vde_tunctl [-f tun-clone-device]  [-u owner]  [-t device-name]

       vde_tunctl [-f tun-clone-device] -d device-name

DESCRIPTION

       vde_tunctl  allows the host sysadmin to preconfigure a TUN/TAP device for use by a particular user.  That user may open and use the device,
       but may not change any aspects of the host side of the interface.

       vde_tunctl is a simple copy of tunctl done for practical purposes.

USAGE

       To create an interface for use by a particular user, invoke tunctl without the -d option:

       # vde_tunctl -u someuser
       Set 'tap0' persistent and owned by uid 500

       Then, configure the interface as normal:

       # ifconfig tap0 192.168.0.254 up
       # route add -host 192.168.0.253 dev tap0
       # bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
       # arp -Ds 192.168.0.253 eth0 pub

       To delete the interface, use the -d option:

       # vde_tunctl -d tap0
       Set 'tap0' nonpersistent

SEE ALSO

       vde_switch(1) vde_plug2tap(1)

AUTHOR

       tunctl was written by Jeff Dike jdike@karaya.com

       This manual page is based on tunctl manual page written by Matt Zimmerman mdz@debian.org for the Debian GNU/Linux system.

																     VDE_TUNCTL(8)