Basic DMZ routing
Grey100 last edited by
I'm having some serious bother setting up a DMZ using a transparent bridge.
My aim is to produce a DMZ network on which I can provide public IPs to my servers. I have been assigned a /29:
xxx.xxx.184.192 - Network xxx.xxx.184.193 - Gateway (provided by my ISP) xxx.xxx.184.194 - pfSense box xxx.xxx.184.195 - reserved for Server 1 xxx.xxx.184.196 - reserved for Server 2 xxx.xxx.184.197 - reserved for Server 3 xxx.xxx.184.198 - reserved for Server 4 xxx.xxx.184.199 - Broadcast
WAN ---> pfSense (xxx.xxx.184.194) ---> LAN (192.168.1.1/24) ---> irrelevant ---> DMZ (192.168.145.1) ---> Server 1 (xxx.xxx.184.195) ---> Server 2 (xxx.xxx.184.196) ---> Server 3 (xxx.xxx.184.197) ---> Server 4 (xxx.xxx.184.198)
First up, I disabled the pfSense firewall (in the advanced options - "Disable all packet filtering.") for debugging purposes.
I thenfollowed the instruction at http://blog.cycomptec.com/bridge-pfsense-firewall-public-private-ips-connected-dmz.
I set the DMZ interface to have "None" IPv4 configuration type, and assigned 192.168.145.1 to the DMZ-Bridge interface (called BridgeDHCP in the guide).
I then attached Server 1 to the DMZ network and assigned it a public IP and set it's default route to be the pfSense box.
This gives us the following:
root@box:~# ifconfig eth0 xxx.xxx.184.195 netmask 255.255.255.248 root@box:~# route add default gateway xxx.xxx.184.194 root@box:~# ifconfig eth0 Link encap: Ethernet HWaddr [removed] inet addr: xxx.xxx.184.195 Bcast xxx.xxx.184.199 Mask: 255.255.255.248 [...] root@box:~# route Kernal IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default xxx.xxx.184.194 0.0.0.0 UG 0 0 0 eth0 127.0.0.1 * 255.255.255.255 UH 0 0 0 lo xxx.xxx.184.192 * 255.255.255.248 U 0 0 0 eth0
At this point, I can ping the pfSense public IP (xxx.xxx.184.194) and it's private IP (192.168.145.1). I cannot ping the ISP provided gateway (xxx.xxx.184.193).
To debug, I ran a traceroute. Packets seem to be getting as far as the pfSense box then stopping.
root@box:~# traceroute 184.108.40.206 traceroute to 220.127.116.11(18.104.22.168), 30 hops max, 38 byte packets 1 xxx.xxx.184.194 (xxx.xxx.184.194) 0.296ms 0.234ms 0.184ms 2 * * * 3 * * *
Does anybody have any idea why my packets are stopping, and how I can get my servers talking to the wider internet?
Edit: it gets worse…
It appears that this configuration is unstable for some reason and Server 1 can only ping the pfSense box intermittently and traceroutes are failing on hop 1 now. This may be a symptom of poor configuration or a whole other issue, but I feel it is relevant.