At 12:08 6/9/2004, Al wrote:
I didn't set default gateway (if that's what you meant "default route")
I just bring up two interfaces with: >ifconfig eth0 172.20.1.30 netmask 255.255.255.0 >ifconfig eth1 172.20.1.31 netmask 255.255.255.0
that's it. no more route or other commands.
So as root:
# ip addr show # ip route show # route -n
What do those commands show?
[root@AL sbin]# ./ifconfig
eth0 Link encap:Ethernet HWaddr 00:01:29:4C:06:46
inet addr:172.20.1.30 Bcast:172.20.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:566 errors:0 dropped:0 overruns:0 frame:0
TX packets:464 errors:12 dropped:0 overruns:0 carrier:24
collisions:0 txqueuelen:100
RX bytes:46725 (45.6 Kb) TX bytes:39630 (38.7 Kb)
Interrupt:11 Base address:0x7000eth1 Link encap:Ethernet HWaddr 00:02:B3:A3:D6:B0
inet addr:172.20.1.31 Bcast:172.20.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:640 errors:0 dropped:0 overruns:0 frame:0
TX packets:118 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:94134 (91.9 Kb) TX bytes:9336 (9.1 Kb)
Interrupt:11 Base address:0xdc00 Memory:dd021000-dd021038[root@AL sbin]# ./ip addr show
1: lo: <LOOPBACK> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:01:29:4c:06:46 brd ff:ff:ff:ff:ff:ff
inet 172.20.1.30/24 brd 172.20.1.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:02:b3:a3:d6:b0 brd ff:ff:ff:ff:ff:ff
inet 172.20.1.31/24 brd 172.20.1.255 scope global eth1
[root@AL sbin]# ./ip route show
172.20.1.0/24 dev eth0 scope link
172.20.1.0/24 dev eth1 proto kernel scope link src 172.20.1.31
169.254.0.0/16 dev eth1 scope link
default via 172.20.1.254 dev eth0
default via 172.20.1.254 dev eth1
[root@AL sbin]# ./route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.20.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
172.20.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
0.0.0.0 172.20.1.254 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 172.20.1.254 0.0.0.0 UG 0 0 0 eth1
[root@AL sbin]#
----------- my setups------------------------------------------------
_________eth0 172.20.1.30 _______________ |#1 PC |-----------------> |Wireless AP | |Linux | |Router |->ADSL->Internet |Http |eth1 172.20.1.31 |172.20.1.254 | |Server |...wireless......> |_____________| |_______| ^ | __________ | |#2 PC | | |Windows |NIC 172.20.1.32 | |Http |-----------------------| |client | |________|
Network: 172.20.1.X, netmask: 255.255.255.0
Ping test: <on #2 PC> c:\ping 172.20.1.31 receive ping reply from #1 PC as long as eth0 is plug even if wireless path not working. If eth0 is unplug, c:\ping 172.20.1.31 won't get reply. Thus, I think all traffic go to eth0 for linux if two interfaces exist in the same subnetwork.
<if change #1 PC from Linux to Windows> <on #2 PC> c:\ping 172.20.1.31, unplug eth0's wire won't affect ping. That is, I think for windows: ping 172.20.1.30 get reply from eth0, unplug eth1 won't affect ping ping 172.20.1.31 get reply from eth1, upllug eth0 won't affect ping
My application: #2 PC's browser can access #1 PC by IP address. I need to ensure that when #2 PC access http://172.20.1.31, traffic go thru eth1, not eth0. Can this be done in linux? Or some commands (route/netmask/etc. settings)? Or need change linux's IP stack source code a bit?
Thanks,
AL
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