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Posted by Trendkill on July 24, 2008, 2:30 pm
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> I've a network that involves multiple VLANs, so there is a lot of VLAN
> trunking going on. =A0Up until now, this hasn't been a problem.
>
> But I'm now in a situation where two sets of systems are having a very
> asymmetric behavior. =A0One set cannot get the MAC addresses for IPs in t=
he
> other set. =A0The other set can get the MAC addresses for IPs in the firs=
t
> set.
>
> If a machine in the other set proactively connects to a machine in the
> first set, then that machine now has the MAC address and can connect back
> to the machine in the other set.
>
> So ARP requests appear to work only in one direction. =A0
>
> These machines are connected by a chain of switches speaking over 802.1q
> trunk ports. =A0What could I possibly have done to cause this behavior? =
=A0I
> wouldn't even know how to recreate this if I wanted to!
>
> Thanks...
>
> =A0 =A0 =A0 =A0 Andrew
Do you have a subnet mask issue? If the first set only had say a /25
as their mask, then they would arp for their gateway for say a .130
address. If however they were arped FOR, they should respond with
their mac. I presume that all of these machines are in the same vlan/
subnet? Are the 'groups' all on two different or specific switches,
or its a logical group off of multiple devices w/ no rhyme or reason?
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