Forum Discussion
Brerr
Nimbostratus
NimbostratusNewbie LTM lab setup question
I'm setting up a lab to do v simple LTM Load balancing, I have a small/medium knowledge of f5 and have got quite a way in but am struggling at what I think is the final hurdle I have 2 VMS (192.168....
Mayur_Sutare
MVP
MVPI am happy to know that my earlier response helped you to get understanding about SNAT.
Moving ahead,
1. can you please provide configuration done on VS and also routes present on F5.
2. On your point which is related to having DNS query coming from subnet 192.168.33.0/24, this is one approach but one question here, is DNS servers knows F5 subnet (10.0.0.x). What are the routes on servers/VM?
Also as its Linux VM , can you please check IP tables on it if any?
Mayur
Brerr- Virtual server config pasted below:
show running-config ltm virtual
ltm virtual VS1-10.0.0.10-TCP {
description VS1-TCP
destination 10.0.0.10:domain
ip-protocol tcp
mask 255.255.255.255
pool Pool1
profiles {
tcp { }
}
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
translate-port enabled
vs-index 4
}
ltm virtual VS1-10.0.0.10-UDP {
description VS1-UDP
destination 10.0.0.10:domain
ip-protocol udp
mask 255.255.255.255
pool Pool1
profiles {
udp { }
}
source 0.0.0.0/0
source-address-translation {
type automap
}
translate-address enabled
translate-port enabled
vs-index 3
}
Below is routing table on the f5 using netstat -nr
netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
127.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 tmm
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 internal
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.33.0 0.0.0.0 255.255.255.0 U 0 0 0 external
192.168.59.0 0.0.0.0 255.255.255.0 U 0 0 0 HA
127.7.0.0 127.1.1.253 255.255.0.0 UG 0 0 0 tmm
127.20.0.0 0.0.0.0 255.255.0.0 U 0 0 0 tmm_bp
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0
The DNS Servers have two interfaces (one shown below as an example)
eth0: 192.168.1.20/24 gw 192.168.1.254 This is a bridged network on the laptop, connected also to the management interface of the f5 (192.168.1.110)
eth1: 192.168.33.20/24 no gw. This is a host only network on the laptop also connected to the f5 (192.168.33.10)
There is no iptables running on the linux VMs
Below is routing table on vm using netstat -nr
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.33.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
So as you can see the linux VMs do not know about 10.x
My aim is to get this working as simply as possible (its just a lab) but also in a way that would typically be done in production.
Thanks again for your help I really appreciate it.
Brett