On Thu, Jan 25, 2007 at 12:14:56AM +0900, GodSharp wrote:
Hi Guys,
Just wondering for some reason when I switched providers(DSL) IP aliasing
stopped working. And, I am not sure what kind of modem this is, the previous
one had some Ethernet ports at the back(it has a bult-in 4 port switch) the
new doesn't have one, only a single Ethernet port and It is directly
connected to my Linux box.
My provider gave me a /24 subnet and 9 useable IP's.
# ip a s eth2
6: eth2: BROADCAST,MULTICAST,UP mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:08:a1:72:c1:f5 brd ff:ff:ff:ff:ff:ff
inet xxx.xxx.xxx.50/24 brd xxx.xxx.xxx.255 scope global eth2
inet xxx.xxx.xxx.51/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.52/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.53/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.54/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.55/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.56/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.57/24 brd xxx.xxx.xxx.255 scope global secondary eth2
inet xxx.xxx.xxx.58/24 brd xxx.xxx.xxx.255 scope global secondary eth2
-- settings --
ip link set eth2 up
ip addr flush dev eth2
ip addr add xxx.xxx.xxx.50/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.51/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.52/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.53/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.54/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.55/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.56/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.57/24 brd xxx.xxx.xxx.255 dev eth2
ip addr add xxx.xxx.xxx.58/24 brd xxx.xxx.xxx.255 dev eth2
ip route add default via xxx.xxx.xxx.1
--- end settings ---
/proc/sys/net/ipv4/ip_forward is 1
/proc/sys/net/ipv4/ip_dynaddr is 1
works: ping google.com -I eth2
works: ping google.com -I xxx.xxx.xxx.50
not working: ping google.com -I xxx.xxx.xxx.58
have you tried ip route get it will tell you what the kernel is thinking on how
its going to route the packet.
you might also need to setup some ip rule lines for each of the secondary
addresses. but first try pinging the next hop with each of the addresses !
From the outside I can ping xxx.xxx.xxx.50 but cannot ping any secondary
IP's.
I tried tcpdump but didn't receive any replies from the secondary ip's I got
replies from the primary IP though.
If I remove the secondary IP's and use it on another computer the secondary
IP works. It looks like I can
only use 1 IP per computer(per mac). What seems to be the problem? Is it the
modem? I am not sure about adsl's and their type of settings (bridge/router)
and I would like to contact my provider. But I am having troubles on asking
them regarding the problem. If there's a technical explanation regarding
this or some trick it would help me clarify them or me.
There are no filters involved(iptables). On my previous provider aliasing
works both are dsl's.
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