[gate:~] # pkg_add -r dynagen

[gate:~] # rehash

root@gate:~# apt-get install dynagen

gate# dynamips -H 7200 &

gate# cat gate.net

[localhost]
        [[7200]]
        image = c7200-is-mz.122-13.T10.bin
        ram = 160

        [[ROUTER GATE]]
        F0/0 = NIO_gen_eth:em0

[ms:~val] # dynagen gate.net

=> list
Name       Type       State      Server          Console   
GATE       7200       running    localhost:7200  2000    

=> shell telnet localhost 2000

...
         --- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]: no

Router# show run

hostname gate.corpX.un

interface FastEthernet0/0
 no shut
 ip address 192.168.X.1 255.255.255.0

interface FastEthernet0/0.2
 no shut
 encapsulation dot1Q 2
 ip address 192.168.100+X.1 255.255.255.0

router ospf 100
 network 192.168.X.0 0.0.0.255 area 0
 redistribute connected subnets

[g13:/var/db/dynagen] # cat simple1.net
[localhost]

    [[7200]]
    image = /var/db/dynagen/c7200-is-mz.122-13.T10.bin
    npe = npe-400
    ram = 160
        
    [[ROUTER R1]]
    s1/0 = R2 s1/0
    
    [[router R2]]

--------------------------------------


[g13:/var/db/dynagen] # cat qemulab.net 
[localhost]
        [[7200]]
        image = /var/db/dynagen/c7200-is-mz.122-13.T10.bin
        ram = 96

        [[ROUTER R13]]
        F0/0 = NIO_gen_eth:fxp0
        F1/0 = NIO_gen_eth:tap0

--------------------------------------


[g13:/var/db/dynagen] # cat distrlab.net 
[195.19.32.3]
        [[7200]]
        image = /var/db/dynagen/c7200-is-mz.122-13.T10.bin
        ram = 96

        [[ROUTER R1]]
        s1/0 = R2 s1/0
        F0/0 = NIO_gen_eth:fxp0

[195.19.32.6]
workingdir = /var/db/dynagen/
        [[7200]]
        image = /var/db/dynagen/c7200-is-mz.122-13.T10.bin
        ram = 96

        [[ROUTER R2]]
        F0/0 = NIO_gen_eth:sis0

--------------------------------------