07-16-2013
No reply to NDP request from Linux host
Hi, new here.
We are attempting to prove that an application will be able to carry IPv6. All is fine with IPv4 but not so much with IPv6. For now, we're just starting to ping between hosts to ensure basic communication.
I'll try to put as much info but of course feel free to ask for more.
Ping from Linux to Windows host:
NDP request is sent out, Window replies. Ping goes out. All is good.
Ping from Windows to Linux host:
NDP request is sent from Windows but linux host does not reply. We're stuck
Ping from Linux to Linux host:
NDP request is sent but linux host does not reply. We're stuck
So it might be as simple as a few kernel options we missed but we cannot figure which one. We are using Kernel 2.6.24. Yes, it is old. But nothing we've read seems to indicated that it cannot work on 2.6.24.
Any insight appreciated.
Lou
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LEARN ABOUT OPENDARWIN
ndp
NDP(8) BSD System Manager's Manual NDP(8)
NAME
ndp -- control/diagnose IPv6 neighbor discovery protocol
SYNOPSIS
ndp -a [-nt]
ndp -A wait [-nt]
ndp -c [-nt]
ndp -d [-nt] hostname
ndp -f [-nt] filename
ndp -H
ndp -I [delete | interface]
ndp -i interface [flags...]
ndp -p
ndp -P
ndp -r
ndp -R
ndp -s [-nt] nodename ether_addr [temp] [proxy]
DESCRIPTION
The ndp command manipulates the address mapping table used by Neighbor Discovery Protocol (NDP).
-a Dump the currently existing NDP entries.
-A wait
Repeat -a (dump NDP entries) every wait seconds.
-c Erase all the NDP entries.
-d Delete specified NDP entry.
-f Parse the file specified by filename.
-H Harmonize consistency between the routing table and the default router list; install the top entry of the list into the kernel rout-
ing table.
-I [delete | interface]
Shows or specifies the default interface used as the default route when there is no default router. If no argument is given to the
option, the current default interface will be shown. If an interface is specified, the interface will be used as the default. If a
special keyword delete is specified, the current default interface will be deleted from the kernel.
-i interface [flags...]
View ND information for the specified interface. If additional arguments flags are given, ndp sets or clears the specified flags for
the interface. Possible flags are as follows. All of the flags can begin with the special character '-', which means the flag
should be cleared.
nud turn on or off NUD (Neighbor Unreachability Detection) on the interface. NUD is usually turned on by default.
-n Do not try to resolve numeric address to hostname.
-p Show prefix list.
-P Flush all the entries in the prefix list.
-r Show default router list.
-R Flush all the entries in the default router list.
-s Register an NDP entry for a node. The entry will be permanent unless the word temp is given in the command. If the word proxy is
given, this system will act as an proxy NDP server, responding to requests for hostname even though the host address is not its own.
-t Print timestamp on each entries, to make it possible to merge output with tcpdump(1). Most useful when used with -A.
RETURN VALUES
The ndp command will exit with 0 on success, and non-zero on errors.
SEE ALSO
arp(8)
HISTORY
The ndp command first appeared in WIDE Hydrangea IPv6 protocol stack kit.
BSD
May 17, 1998 BSD