efflandt
join:2002-01-25
Elgin, IL
 ·AT&T Midwest
| reply to dirtbiker1824
Re: using a network bridge
I knew that when I had a proxy_arp wireless /29 subnet of my of my main /24 LAN, that arp from the main LAN showed the MAC of the Linux box doing proxy_arp instead of MAC of IPs behind it. It actually had 3 nics, 1 pppoe, 1 LAN, 1 WAP11.
But I did not realize that MACs were not transparent across a bridge (even though IPs are) until I got a 2Wire 2700HG-B wireless/modem/router and started using a Zyxel router as wireless client bridge to connect my wired desktop and occasionally an old laptop. The 2Wire automatic or manual local DNS assigns names based on IP and uses names to set up port forwarding, but remembers names/forwarding based on MAC (in case DHCP assigns different IP). That can throw a wrench into port forwarding or MAC based access control for anything behind the bridge.
So if you are going to have a server behind a bridge, it may be best if that is the only thing behind that bridge. My Linux box is wired directly to one of the modem/router ports, so I have no issues with internet access for its ssh or www (using no-ip.com dynamic DNS). |
