ip assignment fails to eth1 interface

Hello

My system has two interface eth0 and eth1 & I am trying to assign ip address
to eth0 and eth1 using pump utility. As shown in figure below eth0 will get
ip from dhcp server1 and eth1 from dhcp server2. dhcp1 will provides ip
address of network 192.168.10.0 while dhcp server2 will provides
192.168.11.0

                       |          |
dhcp server1 ----- eth0| my syetm |eth1 --------   dhcp server2
                       |          |

when i run pump -i eth0 command  ip address is sucessfully  assigned to eth0
(192.168.10.x) . Now After that i run pump -i eth1 . but ip assignment to
eth1 failed some time. And if eth1 get ip address (192.168.11.x) then
sometime i am not able to ping any another system on network 192.168.11.0
Can you suggest me why this is happening ??

One more thing does it better that interface (for which pump is run) should
be up  ?

Thanks in advance
Regards,
Anil