i am using linux for my servers. eth1 lets say have 192.168.1.1 IP address and eth0 have 126.96.36.199 IP address. how will i design my vlans. can i place them on a same vlan?
Concept of VLAN aims at a different reason, It will be used virtually to separate LAN to multiple segments. VLAN interface configuration will say about the IP Subnet range.
However it suggested to have a /24 subnets.
You can configure the two mentioned ip subnets in a vlan but it will not make sense as you are combine full Class A to Class C into one subnet.
In the following example you can find the configuration about the interface with the vlan. Here there is a bond interface, but is the same if you use eth :
iface bond0 inet static
up /sbin/ifenslave bond0 eth0 eth2 eth3
up vconfig add bond0 2
up /sbin/ifconfig bond0 0.0.0.0
up ip addr add 172.16.0.6/25 brd 172.16.0.127 dev bond0.2
up ip link set bond0.2 up
up vconfig add bond0 4
up ip addr add 172.16.0.130/25 brd 172.16.0.255 dev bond0.4
up ip link set bond0.4 up
iface bond1 inet static
up /sbin/ifenslave bond1 eth1 eth4 eth5
up vconfig add bond1 90
up ip addr add 192.168.90.2/24 brd 192.168.90.255 dev bond1.90
up ip link set bond1.90 up
up vconfig add bond1 91
up ip addr add 192.168.91.2/24 brd 192.168.91.255 dev bond1.91
up ip link set bond1.91 up