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25kTV

One computer, Two LAN adapter, Two IP's in same subnet with DHCP

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I have problems with networks. Troubles started when the ISP (Fiber) provided the same subnet for both lines. eth0 78.56.xxx.aaa eth1 78.56.yyy.bbb

@:route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         78.56.255.254   0.0.0.0         UG    0      0        0 eth0
78.56.192.0     0.0.0.0         255.255.192.0   U     0      0        0 eth0
78.56.192.0     0.0.0.0         255.255.192.0   U     0      0        0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 lan1
172.22.22.0     0.0.0.0         255.255.255.0   U     0      0        0 lan1

@:ifconfig
eth0 inet addr:78.56.xxx.aaa  Bcast:78.56.255.255  Mask:255.255.192.0
eth1 inet addr:78.56.yyy.bbb  Bcast:78.56.255.255  Mask:255.255.192.0

Configuration (when it was old IP 85.206.YYY.BBB everything worked fine):

allow-hotplug eth0 
iface eth0 inet dhcp 

allow-hotplug eth1 
iface eth1 inet dhcp 
  post-up ip route add 78.56.192.0/18 dev eth1 src 78.56.yyy.bbb table eth1 
  post-up ip route add default via 78.56.255.254 dev eth1 table eth1 
  post-up ip rule add table eth1 from 78.56.yyy.bbb

And now there is a problem with DHCP renewal. When eth1 is run with ifup, everything works fine, but when renewal starts, line access is gone (ifdown eth1 && ifup eth1 and works well again until renewal)

dhclient[2823]: message repeated 8 times: [ DHCPREQUEST of 78.56.YYY.BBB on eth1 to 78.56.255.254 port 67 (xid=0x6fe207d3)]

Is it possible to fix this trouble? Maybe what did I miss or did I do wrong? Or is it impossible?

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