On Thu, May 03, 2007 at 10:25:48PM +0200, Øyvind Vågen Jægtnes wrote: > Hi, > > We have a one gigabit internet connection that is normally > routed by a hardware juniper router. The drive in this is down > and we need to use a linux machine (Pentium D 3 ghz) as a > temporary router. > Now setting up all the 600 vlans and assigning ip addresses > is no problem. We have testet all by using a laptop, setting up > 600 vlan interfaces on this and running dhcpclient on all. > This worked just fine, all the interfaces got address. > > Now for the real setup. > We closed the mac of the juniper to the network card that > would be connected to the internal LAN, set up the interfaces, > and swapped cables. This worked fine for approximately 100 > of the computers that are connected, but the rest would not > get IP. The connected 100 computers were routed just fine. > > What we think the problem is, is that the arp cache on the > linux router seems strange. It can resolve the MAC for the > 100 clients that actually got through. > For the rest all we see in the arp cache is (incomplete)
I suspect that your arp cache is full (128 entries by default). Check /proc/sys/net/ipv4/neigh/gc_thresh1 (128 for me). You can set it as high as gc_thresh2 (512 for me), and I don't know what happens above. Hoping this helps, Willy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
