I have a vmware linux virtual machine with 2 “virtual physical ” interfaces (eth0 and eth1) virtual eth0 is bridged to the laptop eth0 physical interface and virtual eth1 is bridged to a eth0.172 virtual interface in the vlan 172. All these connected to the switch port … untagged for VLAN 1 and tagged for VLAN 172. I need to create a VLAN 1010 over the virtual eth1 inside the virtual machine to communicate to the vlan 1010 in the switch.

Can that be possible?

What is a VLAN ID? How do you know what your VLAN ID is?

Box1:
# vconfig add eth0 5
# ifconfig vlan5 10.0.0.1/24

Box2:
# vconfig add eth0 5
# ifconfig vlan5 10.0.0.2/24

If both boxes are connected to the same network, I’d assume pinging from one to the other shall work:
Box1:
# ping 10.0.0.1
PING 10.0.0.1 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.1: icmp_req=1 ttl=64 time=0.037 ms
64 bytes from 10.0.0.1: icmp_req=2 ttl=64 time=0.021 ms
^C

# ping 10.0.0.2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
From 10.0.0.2 icmp_seq=1 Destination Host Unreachable
From 10.0.0.2 icmp_seq=2 Destination Host Unreachable
From 10.0.0.2 icmp_seq=3 Destination Host Unreachable
^C

Routing is set up OK on both boxes:
Box1:
# route
Kernel-IP-Routentabelle
Ziel Router Genmask Flags Metric Ref Use Iface
10.0.0.0 * 255.255.255.0 U 0 0 0 vlan5

Box2:
# route
Kernel-IP-Routentabelle
Ziel Router Genmask Flags Metric Ref Use Iface
10.0.0.0 * 255.255.255.0 U 0 0 0 vlan5

Since there is nothing than a little, unmanageable switch in between these two hosts …

My question: Can the Linux box be both VLAN manager and router (replace
a Level 3 switch) and firewall or do I need a second Linux with three NICs?

If it can be done with one Linux box and a switch, the I can get the whole
package (DMZ firewall, VLAN-support, VPN, etc) for some $600. The total
power consumption would be around 40 watt (Linux+switch). As green as
it gets :-)

Have anyone done anything similar?

Regards, Bo Svensson

we are on a VLAN Network my issue is on the dhcpd.conf side coz wana configure My opensuse 11 box to serve ip’s (DHCP Server) on diffrent VLAN , Wana Replace our Windows DHCP Server for some Technical Reasons , my susebux has only one phsysical Network interface , is this possible to serve all VLAN? iphelper is already confgured on our L3 Switches , actually OUr Windows DHCP Server is already runnning and serving this vlans , but i just wana replace it with linux

is this a dhcpd issue to vconfig?

heres is our VLAN Scheme

Dept.1

VLAN # xx
Range : 192.168.24.xxx-xxx

Dept.2
VLAN # xx
Range : 192.168.24.xxx – xxx

Dept.3
VLAN # xx
Range : 192.168.24.xxx-xxx

Dept.4
VLAN #xx
Range : 192.168.24.xxx-xxx

Dept. 5
VLAN # xx
Range 192.168.20.xxx.xxx

Server ip : 172.27.0.10
Swtich ip / gateway ip of server : 172.27.0.100
Option domain –name servers : 172.27.0.6

Please note default vlan 172.27.0.x in this case

Switch and server need to be in default lan for communication / or else we need to trunk in case other vlan connected , we need to configure vconfig on server to communicate

For biggner I would recommend to go for the default vlan connectivity

Example :

ddns-update-style interim;
ignore client-updates;
default-lease-time 43200;
max-lease-time 43200;
authoritative;
#-----subnet mask-- broadcast-- gateway-#
option subnet-mask 255.255.255.0;
#option broadcast-address 192.168.1.1;
option routers 172.27.0.100;
option domain-name-servers 172.27.0.6;
# ----------- Server Scope and vlan1 with switches and server--------------#
subnet 172.27.0.0 netmask 255.255.255.0 {
#range 172.27.0.0 172.27.0.50;
option routers 172.27.0.1;
#option subnet-mask 255.255.255.0;
option broadcast-address 172.27.0.255;
#option domain-name-servers 172.27.0.5;
}
# ----------- clients1 Scope-vlan2-------------#
subnet 172.27.1.0 netmask 255.255.255.0 {
range 172.27.1.3 172.27.1.200;
option routers 172.27.1.1;
option subnet-mask 255.255.255.0;
option broadcast-address 172.27.1.255;
#option domain-name-servers 192.168.1.1 #
}

Save the file

Chkconfig –list dhcpd on

{ For enabling the service on all run levels }
Service dhcpd start
In case , dhcp server faild to start , check with log messages

/var/log/messages

Check for the ip helper address in layer 3 swtich , which act as dhcp-relay
Which has to be configured as 172.27.0.10

Troubleshooting Dhcp server start up error :

1) Run the Dhcp service in debug mode
2) Check the ip configuration
3) Check for syntax errors in dhcpd.conf file
4) Check for the right location of the dhcpd file
5) Ping test between the switch and server
6) Possible conflict of other dhcp server may be the issue

dhcpd in the foreground in debug mode with /usr/sbin/dhcpd -d –f

Hopefully, a DHCP server like the one we’ll be configuring will respond. Running tcpdump shows a dhcp request looks like:
17:26:02.003956 00:00:00:00:00:00 > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0×0800), length 342: 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request, length 300
You should notice DHCP running in the process (ps) list. Any problems, check syslog

Congratulations you have finally configured In easy steps

Please let me know how can I test my vlan config using one single Linux PC ?

regards
Arun

Very very basic question, for configuring VLAN in Linux is that necessary to have a manageable switches ??

Thanks,
Sathish

I have a couple of questions:

1.If i want to copy a file from my windows desktop to my linux (RHEL 4.0) virtual machine, how should i do it?

2.How can i assign ip address to my virtual machine?

Thanks
NSiva