Re: A problem with too many network interfaces

From: Attila Nagy (bra_at_fsn.hu)
Date: 05/26/03

  • Next message: Marko Zec: "Re: Network stack cloning / virtualization patches" 
    Date: Mon, 26 May 2003 10:06:27 +0200
To: "Eric W.Bates" <ericx@vineyard.net>

    Eric W.Bates wrote:
    > I'm trying to build a router/filter on FreeBSD 4.8 with 4 real NIC and
    > 32 vlan interfaces.
    > Starting dhcpd generates an error after 15 interfaces:
    > "[interface] not found"
    > My C skills are lacking so while I'm grovelling thru dhcpd source to
    > find the problem; I was wondering if anyone knows of a kernel limit I
    > need to increase?
    It has nothing to do with FreeBSD.
    Take a look at common/discover.c to find the following code snippet:

    void discover_interfaces (state)
             int state;
    {
             struct interface_info *tmp, *ip;
             struct interface_info *last, *next;
             char buf [2048];
                       ^^^^
    Increase the size of buf for example to 32768 and it will work. 

    -- 
Attila Nagy                                   e-mail: Attila.Nagy@fsn.hu
Free Software Network (FSN.HU)           phone @work: +361 210 1415/127
ISOs: http://www.fsn.hu/?f=download            cell.: +3630 306 6758
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