performance about use Linux as a router

performance about use Linux as a router

[jiangtao.jit]

dear all:

i have a x86 PC and i use it as a router
the kernel is 2.6.38

there are two NICs: eth0 and eth1

i configed eth0 as 10.1.0.1
and eth1 as 11.1.0.1
Linux will route between these two cards
and it worked ok in the old days

but recently, i had added a new NIC as eth2 for LAN
so i add a bridge br0 and config it as 10.1.0.1 
then i configed eth0 and eth2 under br0
no ip on eth0 now
like
br0(10.1.0.1)             eth1(11.1.0.1)
     /           \
 eth0          eth2
 |               |
LAN           LAN

i expected that the performance will be better
but unfortunately things become worse

the PC lost packets now

at first, i think maybe there is a loop Under br0, so i disconnected the wire on eth2 or eth0
nothing changed, packets still lost

then i remove br0
config is as before
its'
            eth0(10.1.0.1)          eth1(11.1.0.1)
             |
LAN

then everthing becomes fine, no packet lost

i can't explain why, 
any idea?

thanks




2011-07-06 



jiangtao.jit 
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performance about use Linux as a router

[Calvin Johnson]

Why don't you use tcpdump/wireshark to see where the packets are being
dropped?
What kind of traffic are you passing?
Is it bidirectional?
Also post your route information.

regards,
Calvin

On Wed, Jul 6, 2011 at 4:47 PM, jiangtao.jit <jiangtao.jit@gmail.com> wrote:

> **
> dear all:
>
> i have a x86 PC and i use it as a router
> the kernel is 2.6.38
>
> there are two NICs: eth0 and eth1
>
> i configed eth0 as 10.1.0.1
> and eth1 as 11.1.0.1
> Linux will route between these two cards
> and it worked ok in the old days
>
> but recently, i had added a new NIC as eth2 for LAN
> so i add a bridge br0 and config it as 10.1.0.1
> then i configed eth0 and eth2 under br0
> no ip on eth0 now
> like
> br0(10.1.0.1)             eth1(11.1.0.1)
>      /           \
>  eth0          eth2
>  |               |
> LAN           LAN
>
> i expected that the performance will be better
> but unfortunately things become worse
>
> the PC lost packets now
>
> at first, i think maybe there is a loop Under br0, so i disconnected the
> wire on eth2 or eth0
> nothing changed, packets still lost
>
> then i remove br0
> config is as before
> its'
>             eth0(10.1.0.1)          eth1(11.1.0.1)
>              |
> LAN
>
> then everthing becomes fine, no packet lost
>
> i can't explain why,
> any idea?
>
> thanks
>
>
>
>
> 2011-07-06
> ------------------------------
> jiangtao.jit
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
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performance about use Linux as a router

[jiangtao.jit]

dear all:

i have a x86 PC and i use it as a router
the kernel is 2.6.38

there are two NICs: eth0 and eth1

i configed eth0 as 10.1.0.1
and eth1 as 11.1.0.1
Linux will route between these two cards
and it worked ok in the old days

but recently, i had added a new NIC as eth2 for LAN
so i add a bridge br0 and config it as 10.1.0.1 
then i configed eth0 and eth2 under br0
no ip on eth0 now
like
br0(10.1.0.1)             eth1(11.1.0.1)
     /           \
 eth0          eth2
 |               |
LAN           LAN

i expected that the performance will be better
but unfortunately things become worse

the PC lost packets now

at first, i think maybe there is a loop Under br0, so i disconnected the wire on eth2 or eth0
nothing changed, packets still lost

then i remove br0
config is as before
its'
            eth0(10.1.0.1)          eth1(11.1.0.1)
             |
            LAN

then everthing becomes fine, no packet lost

i can't explain why, 
any idea?

thanks

2011-07-06 



jiangtao.jit 

performance about use Linux as a router

[jiangtao.jit]

>On Wed, Jul 6, 2011 at 3:59 PM, jiangtao.jit <jiangtao.jit@gmail.com> wrote:
>> dear all:
>>
>> i have a x86 PC and i use it as a router
>> the kernel is 2.6.38
>>
>> there are two NICs: eth0 and eth1
>>

>Can you show the interface configs for both the NICS and the Bridge?


dear Sunny:

these are the commands i used
1.i use      ifconfig eth0 0.0.0.0    cleared the eth0's ip
2.brctl addbr br0
3.brctl addif br0 eth0
4.ifconfig br0 10.1.0.1
5.brctl show         like 
bridge name     bridge id               STP enabled     interfaces
br0                                                no              eth0
6.route          like
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        *               255.0.0.0       U     0      0        0 br0
11.0.0.0        *               255.0.0.0       U     0      0        0 eth1
default         11.1.0.2        0.0.0.0         UG    0      0        0 eth1 

are these info useful?
thanks


---------------------

2011-07-06 
jiangtao.jit 

performance about use Linux as a router

[Kristof Provost]

On 2011-07-06 23:48:18 (+0800), jiangtao.jit <jiangtao.jit@gmail.com> wrote:
> 5.brctl show         like 
> bridge name     bridge id               STP enabled     interfaces
> br0                                                no              eth0

You've got a loop in your Ethernet network and spanning tree is
disabled.
The surprising bit is that you manage to get any packets through at all.

Ethernet packets don't have a TTL field, so if they end up in a loop
(for example br0 -> eth0 -> LAN -> eth1 -> br0 -> ...) they just keep
getting repeated.

brctl br0 stp on should fix your network.

I suspect you're trying to do bonding though, which (as far as I know,
having never played with it myself) is configured completely differently 
and might require support from the switch.

Regards,
Kristof

performance about use Linux as a router

[Tharindu Rukshan Bamunuarachchi]

in this case you are creating STP loop and enable of STP will disable either
eth1 or eth0.

what are you trying achieve ? Is it just sending packets over both ethernet
interfaces ?

you better bond those two ethernet interfaces. you need switch configuration
for proper incoming traffic flow.
__
Tharindu "Rukshan" Bamunuarachchi






On Wed, Jul 6, 2011 at 8:29 PM, jiangtao.jit <jiangtao.jit@gmail.com> wrote:

> dear all:
>
> i have a x86 PC and i use it as a router
> the kernel is 2.6.38
>
> there are two NICs: eth0 and eth1
>
> i configed eth0 as 10.1.0.1
> and eth1 as 11.1.0.1
> Linux will route between these two cards
> and it worked ok in the old days
>
> but recently, i had added a new NIC as eth2 for LAN
> so i add a bridge br0 and config it as 10.1.0.1
> then i configed eth0 and eth2 under br0
> no ip on eth0 now
> like
> br0(10.1.0.1)             eth1(11.1.0.1)
>     /           \
>  eth0          eth2
>  |               |
> LAN           LAN
>
> i expected that the performance will be better
> but unfortunately things become worse
>
> the PC lost packets now
>
> at first, i think maybe there is a loop Under br0, so i disconnected the
> wire on eth2 or eth0
> nothing changed, packets still lost
>
> then i remove br0
> config is as before
> its'
>            eth0(10.1.0.1)          eth1(11.1.0.1)
>             |
>            LAN
>
> then everthing becomes fine, no packet lost
>
> i can't explain why,
> any idea?
>
> thanks
>
> 2011-07-06
>
>
>
> jiangtao.jit
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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performance about use Linux as a router

[tao jiang]

2011/7/7 Tharindu Rukshan Bamunuarachchi <btharindu@gmail.com>:
> in this case you are creating STP loop and enable of STP will disable either
> eth1 or eth0.
>
> what are you trying achieve ? Is it just sending packets over both ethernet
> interfaces ?
>
> you better bond those two ethernet interfaces. you need switch configuration
> for proper incoming traffic flow.
> __
> Tharindu "Rukshan" Bamunuarachchi
>
>
>You've got a loop in your Ethernet network and spanning tree is
>disabled.
>The surprising bit is that you manage to get any packets through at all.

>Ethernet packets don't have a TTL field, so if they end up in a loop
>(for example br0 -> eth0 -> LAN -> eth1 -> br0 -> ...) they just keep
>getting repeated.
>
>brctl br0 stp on should fix your network.
>
>I suspect you're trying to do bonding though, which (as far as I know,
>having never played with it myself) is configured completely differently
>and might require support from the switch.
>
>Regards,
>Kristof
>
>

thank you all

today i tried to bring STP on
it seems better now

i did some filtering also

thanks again

best regards.

---------------

jiangtao