I'm unable to ping another host over a bridge I created, I can't see the error -.- It's a remote machine running debian stable with some backports for which I want to set up DHCP on the new Subnet 172.30.xxx.xxx to be used for KVM-Guests.

ifconfig :

bond0     Link encap:Ethernet  HWaddr e4:11:5b:d4:94:30  
      inet addr:10.54.2.84  Bcast:10.54.2.127  Mask:255.255.255.192
      inet6 addr: fe80::e611:5bff:fed4:9430/64 Scope:Link
      UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
      RX packets:34277 errors:0 dropped:0 overruns:0 frame:0
      TX packets:18379 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:2638709 (2.5 MiB)  TX bytes:2887894 (2.7 MiB)

 br0       Link encap:Ethernet  HWaddr f2:fc:4d:7f:15:f0  
      inet addr:172.30.254.66  Bcast:172.30.254.127  Mask:255.255.255.192
      inet6 addr: fe80::f0fc:4dff:fe7f:15f0/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
      TX packets:252 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:0 (0.0 B)  TX bytes:10800 (10.5 KiB)

Pings :

ping -I br0 172.30.xxx.65
PING 172.30.xxx.65 (172.30.xxx.65) from 172.30.xxx.66 br0: 56(84) bytes of data.

--- 172.30.xxx.65 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2017ms

ping -I bond0 172.30.254.65
PING 172.30.xxx.65 (172.30.xxx.65) from 10.54.2.84 bond0: 56(84) bytes of data.
64 bytes from 172.30.x.65: icmp_req=1 ttl=64 time=0.599 ms
64 bytes from 172.30.x.65: icmp_req=2 ttl=64 time=0.575 ms
64 bytes from 172.30.x.65: icmp_req=3 ttl=64 time=0.565 ms
--- 172.30.x.65 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.565/0.579/0.599/0.031 ms

Route :

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.30.x.64   *               255.255.255.192 U     0      0        0 br0
10.54.x.64    *               255.255.255.192 U     0      0        0 bond0
default         10.54.x.65    0.0.0.0         UG    0      0        0 bond0
default         172.30.x.65   0.0.0.0         UG    0      0        0 br0

The Interface :

cat /etc/network/interfaces

auto lo br0
iface lo inet loopback

# Bonding Interface
auto bond0
iface bond0 inet static
address 10.54.x.84
netmask 255.255.255.192
network 10.54.x.64
gateway 10.54.x.65
slaves eth0 eth1
bond_mode active-backup
bond_miimon 100
bond_downdelay 200
bond_updelay 200

iface br0 inet static
        bridge_ports bond0
        address 172.30.x.66
        broadcast 172.30.x.127
        netmask 255.255.x.192
        gateway 172.30.x.65
        bridge_maxwait 0

If you need more info please ask. Thanks for your help !