Web Interface
Ping 6 Command
The SyncServer software executes the following command when pinging an IPv6 address.
ping6 -c 5 -w 5 -I <eth dev> ipv6address
-c 5 sends 5 ping requests.
-w 5 times out after 5 seconds regardless of the target is reachable or not.
ipv6address is the target address (Customer inputs this address in the SyncServer entry
box)
-I <eth dev> specifies the interface which corresponds to the drop down choice:
LAN1 – “-I eth0”
LAN2 – “-I eth1”
LAN3 – “-I eth2”
LANG – “-I eth3”.
The drop down choice of the interface, suggests that it corresponds to where the ping6
packet will be sent from. This is not entirely correct.
For example, the “-I eth0” only means to set the source IP address in the ping packet to that
of the eth0, it does not specify which interface it actually will always use to send out the pack-
ets. The interface the ping6 uses to send out the packets is entirely determined by the Linux
kernel routing table.
If the target Ipv6address is a link-local IPv6 address, the -I <eth dev> must also be a link-
local address as specified in the way that SyncServer port was configured.
For example:
ping6 -c 5 -w 5 -I <LAN1> ipv6address
If the ipv6address is a link-local address, then the LAN1 specified from the SyncServer
drop down menu on the ping page must also be configured with a link-local address. If it is
configured that way then the ping packet will be sent out that LAN1 port.
If the ipv6address address is a global address, then the -I <eth dev> information is ignored
and the Linux kernel routing table decides which port to send the ping packet out of. This is
how it is possible to specify a global address to send a ping6 to, but not have the packet exit
the specified LAN port. It is because either the LAN port did not have a global address spe-
cified, or if it did, the Linux kernel chose not to send the packet out that port, but rather
another LAN port that had a global address assigned.
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