Peter Jeremy wrote:
On 2007-Mar-21 22:08:06 +0100, Jon Otterholm <[EMAIL PROTECTED]> wrote:
I did not mention earlier that all if's are vlan-based sub-intefaces. It
seems that if I move admin-if's on my routers to a different physical if
than the one with the default route, all weird time-exeed/redir are gone
and all traffic on my Nagios-machine are OK.
It seems allmost as if my routers can not hold apart inbound traffic
destined to different sub-if's on one physical if. Can this be it?
I have a old switch at work that understands that IP traffic should be
kept in VLANs but other traffic (eg DECnet) gets flooded across all
VLANs. It got removed from the network very rapidly once the
resulting problems were traced to it.
From what I have seen my problem only concerns ICMP-traffic.
That said, your problem sounds more like a switch/router configuration
problem than a bug. Most managed switches default to a mode where
they try to automatically just work - ie ports automatically enable or
disable STP and switch between untagged and trunk mode depending on
the management packets they see on that port. If you don't have a
homogenous switch network, it's worth noting that some switch vendors
use non-standard MAC addresses for switch management - these packets
won't be recognized as management packets by other vendors' switches
and can result in two switches that are not physically connected
deciding that they _are_ connected and making topology decisions on
that basis.
Interesting. My switch-network is homogeneous D-link and it would not
be the first time we find bugs in their products if that is the case.
But I'm still not convinced it is related to my switches, my switches
are working on L2, ICMP is L4.
I'm just wondering why my problem goes away when moving my admin-vlan to
another nic-port connected to the same switch. Cisco-routers connected
to the same switch do not react to this as my FreeBSD-routers do.
//Jon
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