Wrong VLAN Behaviour

why are we allowed to define multiple VLANs for same hardware with same VLAN tag ?

This is annoying... and on the console only the last one show up of course...

You need to check and forbid this...

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0 HolgerE over 17 years ago

After checking the source I think the only possibility is that the repective interface was DOWN'd after adding the first VID, similar to this:

ifconfig eth0 up
vconfig eth0 42
ifconfig eth0 down
ifconfig eth0 up # now with different interface index
vconfig eth0 42 # 2nd one

This is in fact an error in newer kernels too.
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0 BuBU over 17 years ago in reply to HolgerE

After checking the source I think the only possibility is that the repective interface was DOWN'd after adding the first VID, similar to this:

ifconfig eth0 up
vconfig eth0 42
ifconfig eth0 down
ifconfig eth0 up # now with different interface index
vconfig eth0 42 # 2nd one

This is in fact an error in newer kernels too.

ok but why are you allowing to have more than one vlan with same vlanid through the interface as in any case only the last ip entered will take into account..

I was not expecting it to work at kernel level as it is supposedly to get latest ifconfig... but you probably need to have a popup or message saying that vlanid is already in use... into the gui...
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0 HolgerE over 17 years ago in reply to BuBU

Yes, should be avoided in WebAdmin, but has to be also checked at kernel level.

I hope we have a fix for both of those at the time v7.2 is out.
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0 HolgerE over 17 years ago in reply to HolgerE

For clarity, can you please install a debug kernel there, redo your test and send me the output of 'dmesg'?. The kernel is available from

http://www.astaromail.com/people/heitzenberger/v7/kernel/debug/kernel-default-2.6.16.60-65vl1.i686.rpm

Please install via 'rpm -i kernel-default-2.6.16.60-65vl1.i686.rpm' and the do a reboot.
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0 BuBU over 17 years ago in reply to HolgerE

For clarity, can you please install a debug kernel there, redo your test and send me the output of 'dmesg'?. The kernel is available from

http://www.astaromail.com/people/heitzenberger/v7/kernel/debug/kernel-default-2.6.16.60-65vl1.i686.rpm

Please install via 'rpm -i kernel-default-2.6.16.60-65vl1.i686.rpm' and the do a reboot.

Ok So I've installed your RPM

Here is the results:

First I've only eth2 active which is my admin iface:


asg1:/root # ifconfig 

eth2      Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1C  

          inet addr:192.168.9.251  Bcast:192.168.9.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1367 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1783 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:204128 (199.3 Kb)  TX bytes:1869839 (1.7 Mb)

          Interrupt:193 Base address:0x6200 



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:77486 errors:0 dropped:0 overruns:0 frame:0

          TX packets:77486 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:21337035 (20.3 Mb)  TX bytes:21337035 (20.3 Mb)

And I want to set up vlan 101 for eth1, which is initially down


asg1:/root # ethtool eth1

Settings for eth1:

        Supported ports: [ TP MII ]

        Supported link modes:   10baseT/Half 10baseT/Full 

                                100baseT/Half 100baseT/Full 

        Supports auto-negotiation: Yes

        Advertised link modes:  10baseT/Half 10baseT/Full 

                                100baseT/Half 100baseT/Full 

        Advertised auto-negotiation: Yes

        Speed: 100Mb/s

        Duplex: Full

        Port: MII

        PHYAD: 32

        Transceiver: internal

        Auto-negotiation: on

        Supports Wake-on: pumbg

        Wake-on: d

        Current message level: 0x00000007 (7)

        Link detected: no

I then enable the vlan 101 for eth1
and dmesg gives:


asg1:/root # dmesg -c

eth1: link up, 100Mbps, full-duplex, lpa 0x05E1

802.1Q VLAN Support v1.8 Ben Greear 

All bugs added by David S. Miller 

vlan_ioctl_handler: args.cmd: 0

register_vlan_device: if_name -:eth1:-  vid: 101

About to allocate name, vlan_name_type: 3

Allocated new name -:eth1.101:-

About to go find the group for idx: 3

Allocated new device successfully, returning.

eth1.101: add 01:00:5e:00:00:01 mcast address to master interface

net_enable_timestamp [named]: netstamp_needed=4

An ifconfig gives:


asg1:/root # ifconfig 

eth1      Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1B  

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 b)  TX bytes:84 (84.0 b)

          Interrupt:185 Base address:0x4100 



eth1.101  Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1B  

          inet addr:1.2.3.4  Bcast:1.2.3.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)



eth2      Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1C  

          inet addr:192.168.9.251  Bcast:192.168.9.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1476 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1857 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:218342 (213.2 Kb)  TX bytes:1888271 (1.8 Mb)

          Interrupt:193 Base address:0x6200 



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:79345 errors:0 dropped:0 overruns:0 frame:0

          TX packets:79345 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:21994099 (20.9 Mb)  TX bytes:21994099 (20.9 Mb)

eth1 is up and link status ok:


asg1:/root # ethtool eth1

Settings for eth1:

        Supported ports: [ TP MII ]

        Supported link modes:   10baseT/Half 10baseT/Full 

                                100baseT/Half 100baseT/Full 

        Supports auto-negotiation: Yes

        Advertised link modes:  10baseT/Half 10baseT/Full 

                                100baseT/Half 100baseT/Full 

        Advertised auto-negotiation: Yes

        Speed: 100Mb/s

        Duplex: Full

        Port: MII

        PHYAD: 32

        Transceiver: internal

        Auto-negotiation: on

        Supports Wake-on: pumbg

        Wake-on: d

        Current message level: 0x00000007 (7)

        Link detected: yes

asg1:/root # ethtool eth1.101

Settings for eth1.101:

        Supported ports: [ TP MII ]

        Supported link modes:   10baseT/Half 10baseT/Full 

                                100baseT/Half 100baseT/Full 

        Supports auto-negotiation: Yes

        Advertised link modes:  10baseT/Half 10baseT/Full 

                                100baseT/Half 100baseT/Full 

        Advertised auto-negotiation: Yes

        Speed: 100Mb/s

        Duplex: Full

        Port: MII

        PHYAD: 32

        Transceiver: internal

        Auto-negotiation: on

        Supports Wake-on: pumbg

        Wake-on: d

        Current message level: 0x00000007 (7)

        Link detected: yes

Now adding a second vlan with same vlan id 101 for eth1 with different ip:


asg1:/root # dmesg -c

vlan_ioctl_handler: args.cmd: 0

register_vlan_device: if_name -:eth1:-  vid: 101

register_vlan_device: ALREADY had VLAN registered

net_enable_timestamp [named]: netstamp_needed=5

and ip still from the first one..


asg1:/root # ifconfig 

eth1      Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1B  

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 b)  TX bytes:252 (252.0 b)

          Interrupt:185 Base address:0x4100 



eth1.101  Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1B  

          inet addr:1.2.3.4  Bcast:1.2.3.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)



eth2      Link encap:Ethernet  HWaddr 00:16:3E:5A:AF:1C  

          inet addr:192.168.9.251  Bcast:192.168.9.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1606 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1960 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:232657 (227.2 Kb)  TX bytes:1921572 (1.8 Mb)

          Interrupt:193 Base address:0x6200 



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:80708 errors:0 dropped:0 overruns:0 frame:0

          TX packets:80708 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:22627866 (21.5 Mb)  TX bytes:22627866 (21.5 Mb)

Hope this will help...

and CPU is 92% on that test box... and I've nothing active except vlans [:(]
I've no PF rules, no nat, no IPS, no anti-virus, no web proxy... nothing...


  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                  

 3070 root      25   0 21544  18m 2972 R 43.2  4.9   3:21.85 mdw_daemon.plx                                                                                           

32309 root      15   0 30720  15m 2084 S 14.0  4.1   0:00.43 confd.plx                                                                                                

 2710 root      15   0 30764  17m 3784 S  2.3  4.5   0:07.17 confd.plx                                                                                                

32475 root      17   0  7272 4408 1796 R  1.6  1.1   0:00.05 websec-reporter                                                                                          

32480 root      17   0  6432 4536 1676 R  1.6  1.2   0:00.05 admin-reporter.                                                                                          

32302 root      16   0  9752 7164 2812 R  0.6  1.9   0:00.09 pfilter-reporte                                                                                          

32476 root      17   0  4520 2864 1548 R  0.6  0.7   0:00.02 mailsec-reporte                                                                                          

32477 root      16   0  4648 2932 1548 R  0.6  0.8   0:00.02 vpn-reporter.pl

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