Re: [mpls-linux-general] Problem for establishing a TCP session

[James R. L. <jl...@mi...>]

Can one of you get a serial console setup on the offending machine then
use that to capture the output from the kernel.

In particular I want you to do "mplsadm -d" before sending traffic.  THis
will turn on the MPLS debugging in the kernel.

Thanks.

Jim

On Mon, May 14, 2001 at 03:49:45PM +0200, Cla...@sw... wrote:
> Hi all,
> 
> I have the same problem as Marcello described in his 
> "Kernel Panic with TCP flows" message. 
> 
> I configured the following topology :
> 
> # subnets:	     10.1.2.0/24           10.1.1.0/24        
> # hosts:   	A===================B=====================C
> # interf:    eth0          eth0   eth2            eth2
> # IPaddr:   10.1.2.20      |      10.1.1.10       |
> #          	               10.1.2.10              10.1.1.20
> #
> # labels      ->->->->->->->->->16>->->->->->->->->->->
> # & LSP :     <-<-<-<-<-<-<-<-<-17-<-<-<-<-<-<-<-<-<-<-
> 
> I'm using the mpls-linux-0.990, with the 2.4.1 linux kernel.
> 
> Everthing's working fine for ICMP or UDP flows. I'm using 
> Ethereal to observe traffic and I see the labels, datas
> are transmitted correctly...
> 
> But when I try to establish a TCP session, the client hangs up.
> On the router B, I see the first TCP segment [SYN] 
> going from the client to the host. I also see the 2nd segment
> [SYN,ACK] going from the host to the client. But the 3rd segment
> is never emitted from the dead client... R.I.P.
> 
> Did you solve the problem Marcello ? Does anyone have an idea ??
> 
> Thanks
> 
> 
> 						Claude Germanier
> 
> 
> 
> BTW here are the commands I used to set up the topology :
> 
> SUBN1=``10.1.1.0''
> SUBN2=``10.1.2.0''
> NMSK=``255.255.255.0''
> IP1=``10.1.2.20''
> IP2=``10.1.2.10''
> IP3=``10.1.1.10''
> IP4=``10.1.1.20''
> LBL1=``16''
> LBL2=``17''
> #on A
> route add -net $SUBN2 netmask $NMSK dev eth0
> route add -host $IP4 gw $IP2           
> mplsadm -vd -A -B -O gen:$LBL1:eth0:ipv4:$IP2 -f $IP4/32
> mplsadm -vd -L eth0:0
> mplsadm -vd -A -I gen:$LBL2:0
> #on B
> route add -net $SUBN2 netmask $NMSK gw $IP2
> mplsadm -vd -L eth0:0
> mplsadm -vd -A -B -I gen:$LBL1:0 -O gen:$LBL1:eth2:ipv4:$IP4
> route add -net $SUBN1 netmask $NMSK gw $IP3
> mplsadm -vd -L eth2:0
> mplsadm -vd -A -B -I gen:$LBL2:0 -O gen:$LBL2:eth0:ipv4:$IP1
> #on C
> mplsadm -vd -L eth2:0
> mplsadm -vd -A -I gen:$LBL1:0
> route add -net $SUBN1 netmask $NMSK dev eth2
> route add -host $IP1 gw $IP3            
> mplsadm -vd -A -B -O gen:$LBL2:eth2:ipv4:$IP3 -f $IP1/32
> 
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-- 
James R. Leu