[VLAN] problem with basic topology

Wed Aug 23 14:47:30 PDT 2006

Thanks for your replies.

PWLA8391GT is a vlan-aware card and eth0 is up.  I'll test  with  time 
delay and see if it solves the problem.  Actually box B which seems to 
have no problem(transmitting and receiving) has a 533 MHz Via Eden CPU 
while box A has a Amd Athlon 64 X2 3800+ CPU. Box A should definitely 
execute its initscript much faster than box B.

 I tried to introduce a sleep statement just after 'vconfig 
set_name_type VLAN_PLUS_VID_NO_PAD' on box A and B. Same  problem. Also  
tried  to  add 'sleep  1' on a line below every statement. No go.  Cant 
find  anything strange in dmesg either.

More ideas?

Best Regards

Andreas

Andreas Søbstad wrote:

> Hi,
> I'm trying to implement the following very basic topology:
>
>
> box A:                        box B:
> _______ eth0           eth0 _______
> |          |_ _ _trunk _ _ _|           |
> |______|                      |_______|
>
> Both ethernetcards are 'PWLA8391GT (intel pro/1000 gt desktop 
> adapter)'. The 'e1000' driver is used on both computers.
> The trunk is a crossover-cable connecting the two nics directly.
>
> Box A is runing debian etch(2.6.16-2-amd64-k8-smp)  and has been 
> configured with the following configuration:
>
> ip link set up dev eth0
> modprobe 8021q
> vconfig set_name_type VLAN_PLUS_VID_NO_PAD
>
> vconfig add eth0 2
> ip addr add dev vlan2 10.10.2.2/24 broadcast 10.10.2.255
> ip link set dev vlan2 up
>
> vconfig add eth0 3
> ip addr add dev vlan3 10.10.3.2/24 broadcast 10.10.3.255
> ip link set dev vlan3 up
>
> vconfig add eth0 4
> ip addr add dev vlan4 10.10.4.2/24 broadcast 10.10.4.255
> ip link set dev vlan4 up
>
> ip route add default via 10.10.2.1
>
> Box B is running debian sarge(2.6.15-1-686) and has been configured 
> with the following configuration:
>
> ip link set up dev eth0
> modprobe 8021q
> vconfig set_name_type VLAN_PLUS_VID_NO_PAD
>
> vconfig add eth0 2
> ip addr add dev vlan2 10.10.2.1/24 broadcast 10.10.2.255
> ip link set dev vlan2 up
>
> vconfig add eth0 3
> ip addr add dev vlan3 10.10.3.1/24 broadcast 10.10.3.255
> ip link set dev vlan3 up
>
> vconfig add eth0 4
> ip addr add dev vlan4 10.10.4.1/24 broadcast 10.10.4.255
> ip link set dev vlan4 up
>
>
> If I test the nics without  vlan they work perfectly. If I use them 
> with the above mentioned conf then eth0 on box a won't recive anything 
> while eth0 on box b is able to both transmitt and recive.
>
>
> I did the following test:
>
> on box a:
>
> PING 10.10.2.1 (10.10.2.1) 56(84) bytes of data.
> From 10.10.2.2 icmp_seq=1 Destination Host Unreachable
> From 10.10.2.2 icmp_seq=2 Destination Host Unreachable
> From 10.10.2.2 icmp_seq=3 Destination Host Unreachable
>
> tcpdump: WARNING: eth0: no IPv4 address assigned
> tcpdump: verbose output suppressed, use -v or -vv for full protocol 
> decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> 22:47:43.081271 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:47:44.080780 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:47:46.079810 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:47:47.079327 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:47:48.078966 arp who-has 10.10.2.1 tell 10.10.2.2
>
> tcpdump: verbose output suppressed, use -v or -vv for full protocol 
> decode
> listening on vlan2, link-type EN10MB (Ethernet), capture size 96 bytes
> 22:48:34.087678 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:48:35.087691 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:48:36.087707 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:48:38.087740 arp who-has 10.10.2.1 tell 10.10.2.2
>
> on box b:
>
> tcpdump: WARNING: eth0: no IPv4 address assigned
> tcpdump: verbose output suppressed, use -v or -vv for full protocol 
> decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
> 23:50:40.507796 arp reply 10.10.2.1 is-at 00:0e:0c:b3:9f:d6
> 23:50:41.507648 arp reply 10.10.2.1 is-at 00:0e:0c:b3:9f:d6
> 23:50:43.507542 arp reply 10.10.2.1 is-at 00:0e:0c:b3:9f:d6
> 23:50:44.507419 arp reply 10.10.2.1 is-at 00:0e:0c:b3:9f:d6
>
> tcpdump: verbose output suppressed, use -v or -vv for full protocol 
> decode
> listening on vlan2, link-type EN10MB (Ethernet), capture size 96 bytes
> 22:52:11.076059 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:52:12.076072 arp who-has 10.10.2.1 tell 10.10.2.2
> 22:52:14.076104 arp who-has 10.10.2.1 tell 10.10.2.2
>
> If I do a 'cat /proc/net/dev' on box b I can see that data is being 
> recived and transmitted on eth0 and vlan2 .
> If I do a ' cat /proc/net/dev' on box a I can only see data being 
> transmitted on eth0 and eth2. There is no reciveing and no dropping of 
> packages on the same interfaces. I have tested with another 
> crossover-cable: same result. I have tried also to assign static 
> macaddr in the arp table on both computers but  eth0  on  box a still 
> wont recive anything.
>
>
> Anybody got any ideas on what I am doing wrong?
>
>
>
> Best Regards
>
> Andreas
> _______________________________________________
> Vlan mailing list
> Vlan at candelatech.com
> http://www.candelatech.com/mailman/listinfo/vlan