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johan84

Member

Registered: 2010-02-08

Posts: 8

[Solved] VLAN: 2 IPs 1 NIC (Unreachable)

Hi

I have 1 network card and I want to assign 2 local IPs.
When I add a VLAN with "vconfig add eth0 0" I get an extra interface eth0.0 after restarting.
The problem is that, after assigning an IP and setting the default gateway, I loose my connection with the network.
When I put the interface down I get my connection back.
It is possible on the host to ping from one IP to the other but pinging from another host isn't possible while the interface eth0.0 is up.

I do see the ping request (ICMP packet) in wireshark.
And when there's an ARP packet with the IP of the VLAN / eth0 wireshark indicates "duplicate use of *ip* detected)
I'm certain that the IP is unique.

Last edited by johan84 (2010-02-25 19:03:57)

daf666

Member

Registered: 2007-04-08

Posts: 470

Website

Re: [Solved] VLAN: 2 IPs 1 NIC (Unreachable)

What you are doing should work, if this port was connected to a trunk.
Instead, just add an alias:
ifconfig eth0:0 11.22.33.44

johan84

Member

Registered: 2010-02-08

Posts: 8

Re: [Solved] VLAN: 2 IPs 1 NIC (Unreachable)

What you are doing should work, if this port was connected to a trunk.
Instead, just add an alias:
ifconfig eth0:0 11.22.33.44

Nice, thanks for the quick response.
Too bad it hasn't statistics like a VLAN:
eth0.0 is the one created with vconfig
eth0:0 is created as u suggested. (I was hoping I could use the VLAN to keep different statistics too)

[root@...]# ifconfig
eth0      Link encap:Ethernet  HWaddr --:--:--:--:--:--
          inet addr:192.168.0.3  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::211:9ff:fea2:930/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:126395 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26081 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:33144168 (31.6 Mb)  TX bytes:2923208 (2.7 Mb)
          Interrupt:18 Base address:0xd300 

eth0.0    Link encap:Ethernet  HWaddr --:--:--:--:--:--
          inet addr:192.168.0.133  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::211:9ff:fe11:1111/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2716 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:135411 (132.2 Kb)

eth0:0    Link encap:Ethernet  HWaddr --:--:--:--:--:--
          inet addr:192.168.0.133  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:18 Base address:0xd300 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1683 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1683 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:231004 (225.5 Kb)  TX bytes:231004 (225.5 Kb)

Is it possible to make a VLAN work with a normal switch?
Or do I have to buy special hardware for that? (The VLAN would just be to have 2 IP's and keep statistics on those 2 IP's)
I wanted to forward specific traffic from my real interface to 2 virtual interfaces.

Last edited by johan84 (2010-02-25 19:13:17)