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I've got some strange effects in my network behavior after updating to 12.04 - before all worked fine:

My network is segmented with my desktops residing in 192.168.1.0/28.

My DSL-router lives in a segment 192.168.1.64/30.

My internal router listens to 192.168.1.1 and 192.168.1.65.

My desktop receives its ip address as 192.168.1.8 and its default gateway off course to 192.168.1.1 all via DHCP.

All ip addresses can be accessed within the network 192.168.1.0, but if I ping 192.168.1.66 only the first icmp packet comes back correctly. All subsequent packages return with Desination Host Unreachable - looks quite weird to me.

The dhcpd.conf entry looks like:

subnet 192.168.1.0 
netmask 255.255.255.240 {
option definitions common to all supported networks...
option domain-name "kesenheimer.org";
option domain-name-servers 81.173.194.68,194.8.194.60;
option routers 192.168.1.1;
range 192.168.1.3 192.168.1.14;                                               
}

host beate {
# Ethernet address of the client machine
hardware ethernet 00:0D:60:70:0D:EF;
# IP address to assign
fixed-address 192.168.1.8;
}

I've configured the NetworkManager to:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

and /etc/network/interfaces to:

auto lo
iface lo inet loopback
auto eth0

When I start the network configuration tool, all information sent by DHCP is displayed correctly.

I'm not sure how to fix this problem.

share|improve this question
    
Is your router routing correctly between 192.168.1.0/28 and 192.168.1.64/30? –  jdthood Mar 20 '13 at 9:57

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