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Anon> On Sun, Jan 13, 2002 at 05:31:46PM -0600, Xinwen - Fu wrote:
>> I use libpcap-0.6.2 under redhat 6.1. But pcap_lookupnet() returns
>> an net adress and mask
>> different from the real address specified to ethernet card.
>> pcap_lookupdev() gives the correct name.
>>
>> My network is OK. The ethernet card is right.
>>
>> What's the possible problem
Anon> A Linux kernel bug? "pcap_lookupnet()" just does the standard
Anon> SIOCGIFADDR and SIOCGIFNETMASK calls, which should work.
Anon> You may have to trace through the "pcap_lookupnet()" code to see what
Anon> the SIOCGIFADDR and SIOCGIFNETMASK calls return.
Please see recent (November-ish) flame on linux-netdev.
Search for SIOGIFNETMASK and for Wietse Venema, (who was in the right, but
flamed by multiple clueless people anyway). Linux gratuitously breaks the
SIOCGIFNETMASK APIs because it wants to.
Newer kernels have some patch.
pcap-linux.c should probably use netlink rather than SIOGIFNETMASK if it
wants to be blessed by the Linux networking people.
] ON HUMILITY: to err is human. To moo, bovine. | firewalls [
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[
] [EMAIL PROTECTED] http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy"); [
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