LinuxQuestions.org - Virtual IP responds to arpping but not ping

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Virtual IP responds to arpping but not ping

Hi there.

Operating system:
Debian Lenny 5.08 (2.6.26-2-amd64 #1 SMP Tue Jan 25 05:59:43 UTC 2011 x86_64 GNU/Linux)

I have a network iface eth0 with 2 virtual IP addresses (117.20.2.111 117.20.2.112). The virtual IP addresses I have setup by simply running:

Code:

ifconfig eth0:1 117.20.2.111 up

This has worked fine for 2 virtual IP's but the third one (117.20.2.133) will not respond to ping's though it does respond to arpping's.

There are no firewall iptable rules:

Code:

iptables --list

Chain INPUT (policy ACCEPT)

target    prot opt source              destination

Chain FORWARD (policy ACCEPT)

target    prot opt source              destination

Chain OUTPUT (policy ACCEPT)

target    prot opt source              destination

Output of route -n:

Code:

Kernel IP routing table

Destination    Gateway        Genmask        Flags Metric Ref    Use Iface

117.20.2.0      0.0.0.0        255.255.255.0  U    0      0        0 eth0

117.0.0.0      0.0.0.0        255.0.0.0      U    0      0        0 eth0

0.0.0.0        117.20.2.1      0.0.0.0        UG    0      0        0 eth0

Output of ip rou ls:

Code:

117.20.2.0/24 dev eth0  proto kernel  scope link  src 117.20.2.110 

117.0.0.0/8 dev eth0  proto kernel  scope link  src 117.20.2.111 

default via 117.20.2.1 dev eth0

Any help would be appreciated.
thanks.

Can't help really, but things to consider:

is there a limit to the number of virtual IP's you can bind to a real one?
is the *.133 address declared somewhere? And is it attached to a hardware interface?
is the *.133 address within the network range? (it should, but are you absolutely sure?)

Thanks Dutch Master:

I don't think there's a limit. I've tried searching to find out. All I came up with is http://forums11.itrc.hp.com/service/...hreadId=943644 which seems to say that you can have at least 200 or so.

Is the 133 address declared somewhere? I'm sorry I'm not sure what you mean.... I don't believe it is used by any other machine and I haven't declared it in any other of my server config.

133 seems to be in network range as it will respond to an arpping.

Cheers.