need help with libnet_if_addr.c - MAX_IPADDR

Hi libnet list,

i have some problems with the latest stable libnet (1.1.0) used by our linux-ha systems (running redhat 8 and 9). The linux heartbeat code (version 1.0.3) relies on libnet to find the hardware adresses of interfaces and broadcasts these for the corresponding ip aliases defined by heartbeat. When heartbeat calls the application which is using libnet the following error is returned:

libnet_open_link_interface: libnet_select_device(): No network interfaces found

My knowledge of C is "very" limited, but i think the problem comes from the limitation to 32 ip adresses per interface, coming from libnet_if_addr where i find #define MAX_IPADDR 32.

I have more than 32 ip adresses on the loopback device, what seems to cause the error. If i reduce the number of ip aliases on the loopback interface to less than 32 everything is fine, but I need about *250* ip addresses on the loopback interface (used for internal communication of the DNS servers).

Is there anybody who can give me some quick hints how to increase the limit with a few changes in the libnet sources?

Any help is appreciated,
Jens Grigel

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Citysavingsbank Munich, Germany
Organisation - Network and Security
Munich, Germany

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