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Problems with ISC DHCP server on bonded IP - AKA HELP!!!!
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finalturismo
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Joined: 06 Jan 2020
Posts: 159

PostPosted: Mon Oct 05, 2020 2:50 pm    Post subject: Problems with ISC DHCP server on bonded IP - AKA HELP!!!! Reply with quote

Help with boned adapter and DHCP ISC integration

So i have a bonded ethernet Adapter. The bond0 interface is working 100% correctly but the DHCP server refuses to hand out an IP when using a 2nd ethernet ethernet port for 77.77.77.1

For example i have a Dell R720XD with a 10GB SFP ethernet card with 2 ports.

My bond0 adapter is bonded across eths1-5.

Once i connect an ethernet cable into any of those 5 bonded ethernet ports to a client computer, i get an IP address with no problems.....

But as soon as i attempt to add a 2nd ethernet cable to eth ports 1-5 i do not get an IP.

It seems as if DHCP client IP address assignment is stopped halfway in-between the process.

I have confirmed the bonding is working with no problems and i have tried all bonding modes.

Anyone happen to know any good ways of debugging the kernel and the DHCP ISC server to see exactly where the problem is?

Also if i cant get this working with ICS DHCP is there another fast, high volume DHCP server i can use?

THE PROBLEM
DHCP ISC only allows me to only use 1 physical port for the set router in dhcpd.conf file regardless of the fact that 77.77.77.1 is the bond0 with the 5 selected ethernet ports.

THE GOALS
A
Get DHCP ISC working with a bonded interface while maintaining a single subnet

OR

B
Configure eth ports 1-5 as a switch pointing to, binded or bridged with 77.77.77.1 while maintaining a single subnet. I pretty much need to get the DHCP server running on ports 1-5. I need to somehow make ports 1-5 part of the 77.77.77.1 router without creating multiple router IPs for each port.

Why?
1. This allows me to have a 10GB DHCP network without purchasing a switch for an ungodly amount of money...
2. I do backups very often that exceed 1TB and sometimes i use my other R720XD to recover broken raids and i have to send the recovered data back over the network to my other R720XD that acts as my server and router.
3. I want to maintain a single small subnet for both performance and simplicity.


/etc/conf.d/net config
Tried with null setting enabled and disabled
Code:

#config_eth1="null"
#config_eth2="null"
#config_eth3="null"
#config_eth4="null"
#config_eth5="null"

slaves_bond0="eth1 eth2 eth3 eth4 eth5"
config_bond0="77.77.77.1 netmask 255.255.255.0"
mode_bond0="balance-alb"




/etc/dhcp/dhcpd.conf
Code:


subnet 77.77.77.0 netmask 255.255.255.0
{
range 77.77.77.2 77.77.77.254;
option routers 77.77.77.1;
option broadcast-address 77.77.77.255;
option domain-name FIXAPC;
option domain-name-servers 77.77.77.1, 8.8.8.8, 1.1.1.1;
default-lease-time -1;
max-lease-time -1;
}






My /etc/conf.d/dhcpd
I have set to bond only to bond0 interface or all interfaces involved in bonding.
Code:


# /etc/conf.d/dhcpd: config file for /etc/init.d/dhcpd

# If you require more than one instance of dhcpd you can create symbolic
# links to dhcpd service like so
#   cd /etc/init.d
#   ln -s dhcpd dhcpd.foo
#   cd ../conf.d
#   cp dhcpd dhcpd.foo
# Now you can edit dhcpd.foo and specify a different configuration file.
# You'll also need to specify a pidfile in that dhcpd.conf file.
# See the pid-file-name option in the dhcpd.conf man page for details.

# If you wish to run dhcpd in a chroot, uncomment the following line
# DHCPD_CHROOT="/var/lib/dhcp/chroot"

# All file paths below are relative to the chroot.
# You can specify a different chroot directory but MAKE SURE it's empty.

# Specify a configuration file - the default is /etc/dhcp/dhcpd.conf
# DHCPD_CONF="/etc/dhcp/dhcpd.conf"

# Configure which interface or interfaces to for dhcpd to listen on.
# List all interfaces space separated. If this is not specified then
# we listen on all interfaces.
DHCPD_IFACE="bond0 eth1 eth2 eth3 eth4 eth5"

# Insert any other dhcpd options - see the man page for a full list.
# DHCPD_OPTS=""




Output of route -n
Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         47.183.193.1    0.0.0.0         UG    9      0        0 eth0
47.183.193.0    0.0.0.0         255.255.255.0   U     9      0        0 eth0
77.77.77.0      0.0.0.0         255.255.255.0   U     0      0        0 bond0
127.0.0.0       127.0.0.1       255.0.0.0       UG    0      0        0 lo


Output of ifconfig
Code:
bond0: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST>  mtu 1500
        inet 77.77.77.1  netmask 255.255.255.0  broadcast 77.77.77.255
        inet6 fe80::92b1:1cff:fe45:368  prefixlen 64  scopeid 0x20<link>
        ether 90:b1:1c:45:03:68  txqueuelen 1000  (Ethernet)
        RX packets 2107785  bytes 285018996 (271.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7209388  bytes 9992799492 (9.3 GiB)
        TX errors 0  dropped 6 overruns 0  carrier 0  collisions 0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 47.183.193.110  netmask 255.255.255.0  broadcast 47.183.193.255
        inet6 fe80::1301:bd2e:1dd2:8c2f  prefixlen 64  scopeid 0x20<link>
        ether 90:b1:1c:45:03:67  txqueuelen 1000  (Ethernet)
        RX packets 7540142  bytes 10034797552 (9.3 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2090695  bytes 435261352 (415.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 41

eth1: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 90:b1:1c:45:03:68  txqueuelen 1000  (Ethernet)
        RX packets 2104771  bytes 284286007 (271.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7162619  bytes 9925116701 (9.2 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 44

eth2: flags=6147<UP,BROADCAST,SLAVE,MULTICAST>  mtu 1500
        ether 90:b1:1c:45:03:68  txqueuelen 1000  (Ethernet)
        RX packets 3014  bytes 732989 (715.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 46769  bytes 67682791 (64.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 45

eth3: flags=6147<UP,BROADCAST,SLAVE,MULTICAST>  mtu 1500
        ether 90:b1:1c:45:03:68  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 62

eth4: flags=6147<UP,BROADCAST,SLAVE,MULTICAST>  mtu 1500
        ether 90:b1:1c:45:03:68  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth5: flags=6147<UP,BROADCAST,SLAVE,MULTICAST>  mtu 1500
        ether 90:b1:1c:45:03:68  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1445347  bytes 230974708 (220.2 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1445347  bytes 230974708 (220.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
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