I have a problem in which one of my network interfaces on my
dual-homed RH 8.0 server is re-activating later after I manually shut
it down (via 'ifdown eth1'). It appears to happen when I attempt to
access a VPN address previously routed to the shutdown interface.
I'm wondering if anyone can tell me how to control this behavior.
Thanks in advance. More details follow...
Thanks,
Ed
===
This is a dual-homed server with network interfaces eth0 and eth1. I
access a VPN at 10.0.0.0/16, and I have 2 VPN clients: one software,
one hardware. When using the hardware client, I configure eth1 and
route VPN addresses to eth1. Unfortunately, the Cisco 3002 hardware
client is not working properly. So I use the s/w client via eth0 as
a backup access channel, and believe I'm routing VPN traffic to eth0.
I have my NICs and routing tables setup to work in either mode as
follows:
When using eth0 + s/w vpn client:
# ifconfig
eth0 Link encap:Ethernet HWaddr ...snip...
inet addr:10.1.2.1 Bcast:10.1.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1356 Metric:1
RX packets:406740 errors:0 dropped:0 overruns:0 frame:0
TX packets:422986 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:175291703 (167.1 Mb) TX bytes:66659541 (63.5 Mb)
Interrupt:10 Base address:0x7000
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref
Use Iface
10.1.2.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default router 0.0.0.0 UG 0 0 0 eth0
When using eth1 + h/w vpn client (which is the reboot mode):
# ifconfig
eth0 Link encap:Ethernet HWaddr ...snip...
inet addr:10.1.2.1 Bcast:10.1.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1356 Metric:1
RX packets:408360 errors:0 dropped:0 overruns:0 frame:0
TX packets:424749 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:175930715 (167.7 Mb) TX bytes:66893033 (63.7 Mb)
Interrupt:10 Base address:0x7000
eth1 Link encap:Ethernet HWaddr ...snip...
inet addr:11.1.2.1 Bcast:11.1.2.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:3 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 b) TX bytes:168 (168.0 b)
Interrupt:5 Base address:0x8000
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref
Use Iface
11.1.2.0 * 255.255.255.0 U 0 0 0 eth1
10.1.2.0 * 255.255.255.0 U 0 0 0 eth0
10.0.0.0 hwvpn 255.255.0.0 UG 0 0 0 eth1
... (snipped other VPN addresses routed to eth1) ...
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default router 0.0.0.0 UG 0 0 0 eth0
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