Pretty easy for me to reproduce. The machine live locks so I can't get anything out of it, serial console or otherwise. :( Imagine a machine with two NICs, fxp0 and fxp1 (though it could be any two NICs). The following commands should lead to a lock:

# Add the primary address on the external NIC
ifconfig fxp0 192.168.1.2 netmask 255.255.255.0 media 100baseTX mediaopt full-duplex


# Add the default gateway
route add default 192.168.1.1

# Add a network to the internal interface
ifconfig fxp1 10.10.10.1 netmask 255.255.255.0 media 100baseTX mediaopt full-duplex


# On the external interface, on the same VLAN, there are two other networks.
# Add aliases that way the machine can participate on those networks.
ifconfig fxp0 alias 192.168.2.250 netmask 255.255.255.255
ifconfig fxp0 alias 192.168.3.250 netmask 255.255.255.255


# Add a route so that machines on the internal network can get
# to the 192.168.2.0/24 network.  This command succeeds.
route add -net 192.168.2.250/24 192.168.2.250

# Add a route so that machines on the internal network can also
# get to the 192.168.3.0/24 network.  This command results in a hard
# lock of the system.
route add -net 192.168.3.250/24 192.168.3.250


I'm unable to debug this problem further. Can someone shed some light onto this and/or help me debug it further? As I've said, I can't even break to a debugger or get at the machine via a serial connection. :( Help? -sc


--
Sean Chittenden

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