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Special Forums IP Networking Same IP | Different port | Different MAC Post 302888642 by @dagio on Sunday 16th of February 2014 10:42:19 AM
Old 02-16-2014
Same IP | Different port | Different MAC

Hello all,

I meet a "strange" situation, at least for me, and i want your opinion.
I have a node used as SIP B2BUA (node A) and i have the following issue.
SIP messages does not reach a client node (node B) but ICMP do.
I see in the pcap that SIP and ICMP messages have different destination MAC address. Only ICMP messages have destination MAC address the MAC of node B.
OS: rhel 6.2
arp table show the MAC of node B.

Any idea?What should i check??

Thanks in advance!

Last edited by @dagio; 02-16-2014 at 11:54 AM..
 

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NG_ETHER_ECHO(4)					   BSD Kernel Interfaces Manual 					  NG_ETHER_ECHO(4)

NAME
ng_ether_echo -- netgraph ether_echo node type SYNOPSIS
#include <netgraph/ng_ether_echo.h> DESCRIPTION
The ether_echo node type reflects all data and control messages back to the sender. It assumes (and does not check) that the packet is an ethernet frame, and swaps the source and destination addresses before echoing it. This node type is used for testing and debugging. HOOKS
A ether_echo node accepts any request to connect, regardless of the hook name, as long as the name is unique. CONTROL MESSAGES
This node type supports only the generic control messages. Any other control messages are reflected back to the sender. SHUTDOWN
This node shuts down upon receipt of a NGM_SHUTDOWN control message, or when all hooks have been disconnected. SEE ALSO
netgraph(4), ng_echo(4), ng_ether(4), ng_hole(4), ngctl(8) HISTORY
The ng_ether_echo node type was implemented in FreeBSD 8.0. AUTHORS
Julian Elischer <julian@FreeBSD.org> BSD
December 24, 2008 BSD
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