similar to: Proxy ARP - Pros & Cons

Hello all, I''ve read the shorewall guides and browsed through the mailing lists, but I haven''t been able to find out if the following is possible or not using shorewall. Our provider has given us 16 IPs + 4 in a separate range for our uplink. I would like to replace that router with a Linux box running shorewall with three interfaces. I want the DMZ to be a standard, routed

Hopefully this is an easy question.... I''m using a leaf router (bearing) running shorewall. Three interfaces net, loc, and dmz. Only one computer in the dmz and its being proxy arp''d. External and internal (net and loc) can reach the dmz but the dmz cannot reach the isp''s gateway and beyond, but can reach a system adjacent to the firewall.

Hi all! I posted earlier about the proxy arp configuration = http://shorewall.sourceforge.net/shorewall_setup_guide.htm#NonRouted, = and was probably not sufficiently knowledgeable on the subject. I''ve = gone through a bunch of documents on proxy arp, subnetting with proxy = arp and the documentation at shorewall, and have come up with a setup = that would be perfect for the job at hand

Hi everyone, I have a question regarding the default gateway for hosts on DMZ zone. I moved servers from parallel to the DMZ (outside the firewall, directly connected to I-net) to inside DMZ. The default gw for these servers was the DSL router(bridge) of my ISP. What should be the default gw (for the hosts inside the DMZ), when hosts are inside the DMZ now - still the DSL router (external

I have tried unsuccessfully to run both Shorewall 1.2.x, 1.3.x with Proxy ARP on a Red Hat 7.2 machine. The machine was configured as the external firewall as per the ''belt and suspenders'' layout given at http://www.skippy.net/linux/firewall/ The firewall appeared to function correctly in all functions except proxy ARP, however I must say I did not test exhaustively. After

My sincere apologies to all on this list. After looking for returning packets with tcpdump and not finding ANY I called our provider to confirm our IP assignment. The IP range that I was given by my boss was incorrect. After adjusting the ip assignments, everything is working perfectly. Thank you all for your time in troubleshooting this, and I hope to be able to return the favor at some

To rephrase the question, "Can I use masquerading and proxy ARP in the same zone simultaneously?" It''s not a stupid question--I couldn''t see any reason why it wouldn''t work, but I had actually try it out to convince myself that it did (which isn''t a bad thing to do before posting the question to the list, by the way). In any case, the answer is

Hi all! I''ve set up a Linux box with shorewall doing proxy arp as per http://www.shorewall.net/shorewall_setup_guide.htm#ProxyARP the 5.2 (non routed) example. Everything is working great except for one thing, and that leads me to my question: is there a conflict between proxy arp and pptp? I''ve set the apropriate ACCEPT rules to allow tcp port 1723 and protocol 47 to the host

Hello, The shorewall version is shorewall-3.0.7-1 installed in Centos 5.1 (kernal 2.6.18-53.el5) on March. Number one problem is: I edited the policy file was dmz loc ACCEPT info I could use 3389 remote desktop to loc Windows 2003 server but couldn''t use SSH (22 port) to loc Linux server. Also I tried open that two ports in

I noticed the long standing Ipsec FSwan problem was fixed. But do you still have to make sure Ipec is not running when shorewall starts Reason I ask Is I could not get my Dmz working with Ipsec in the equation. Thanks Mike

hello there, im running a 3interface inet, dmz, loc. i have some public ip addresses. one public address is the router of the provider, the second one is the linux box running shorewall. all other public interfaces are on the dmz nic with proxy-arp. now whenever i do a traceroute (the dmz boxes are windows, icmp traceroute) the very first hop gets timeout/stars, then the router of the provider

Hello everybody. I could not find an answer to my problem in the archive. (But that may just be me :-) ) I have a problem with proxy arp and connection from loc (localnet) and from the firewall. Works fine from internet to dmz / proxy arp and vise versa. I have a feeling the solution is simple, but I''m no guru in Linux routing etc. The problem seems to be the routing setup. loc -

Hi All, >From the documentation I have read on Shorewall, the preferred approach seems to be, to use Proxy ARP instead of Static NAT for hosting web servers in the DMZ Zone. But I have also read that this could cause problems for VPN configurations. I essentially have multiple public IP''s, which I want to map to private addresses in the DMZ. I also intend to setup a gateway between 2

Hi Alex, and thanks for your time. Probably not. The servers are only configured like they where when they where parallel to the fw. Just the default gateway, same as for the external interface on the fw. That''s what the documentation instructed to configure the servers using arp. But is it required with extra configuration on the server connected via proxy arp? Or is it some parameter

Hello all, i am new to shorewall and i already have a question ;) i am running a mailserver in my dmz (or actually this will be when = evertything will be working fine with shorewall) with public ip = addresses.. i have a subnet of 8 ip addresses (255.255.255.248 mask) and = i was planning of the classic 3 nic (eth0-2) setup... the dmz should = work with proxy-arping...=20 now my quesion is

This is some ramblings on why using proxy ARP (on a host in a DMZ) is a good or bad thing. The good is that a computer X retains a public IP address which makes it easy to connect it directly to the net if the firewall has to be taken down for extended periods. Thus, if computer X is a mail server for example, it can still function in a reduced capacity until the firewall is restored. The bad

I''m trying to enable tftp traffic initiated from our dmz network to our internal network. I have: TFTP(ACCEPT) dmz loc:10.10.10.1 in /etc/shorewall/rules, and: oadmodule nf_conntrack_tftp in /etc/shorewall/modules. The module is loaded and I do see some entries come and go, e.g.: udp 17 10 src=4.28.99.164 dst=10.10.10.1 sport=2071 dport=69 [UNREPLIED]

I am trying to add a machine into my dmz. It is the first machine I''ve ever added to this dmz and fro some reason I cannot establish communication between the dmz and the machine. Here is an example of my setup: ISP router --> firewall (eth0) firewall (eth1) --> local network firewall (eth2) --> DMZ eth0 and eth2 have public IP addresses as does the machine I just added to

thanks again for your sharp eye and speedy response. i have corrected the typos in the IP in the masq file. I am sorry to have to ask for more help but my pc''s on the local network can''t reach the dmz webserver using the webserver''s local or Public IP address. I need to be able to do this in order to test the split DNS setup for the network. Using ethereal on the

Hello, I''m working on a Shorewall-1.2 setup on a _remote_ debian (woody) firewall with several live web and mail servers behind it. I know doing this remotely is a *really* bad idea, and I''d rather not be in this situation, but so it goes... Worst case scenario, I lock myself out and have to drive an hour to get physical access to the machine and restore service. Anyhow,