Ok, repro with local build works.
I tested the buffer sized, the other calls that pcap_open_live does and so on.
Eventually I minimized the changes and found the issue to go away with:
diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c
b/src/nwfilter/nwfilter_dhcpsnoop.c
index 6069e70..c12ba9c 100644
--- a/src/nwfilter/nwfilter_dhcpsnoop.c
+++ b/src/nwfilter/nwfilter_dhcpsnoop.c
@@ -1115,7 +1115,6 @@ virNWFilterSnoopDHCPOpen(const char *ifname, virMacAddr
*mac,
}
if (pcap_set_snaplen(handle, PCAP_PBUFSIZE) < 0 ||
- pcap_set_buffer_size(handle, PCAP_BUFFERSIZE) < 0 ||
pcap_activate(handle) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("setup of pcap handle failed: %s"),
That was defined as:
/*
* libpcap 1.5 requires a 128kb buffer
* 128 kb is bigger than (DHCP_PKT_BURST * PCAP_PBUFSIZE / 2)
*/
# define PCAP_BUFFERSIZE (128 * 1024)
Maybe with more modern libpcap that is not needed or even wrong now.
I have 1.8.1 atm.
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https://bugs.launchpad.net/bugs/1758037
Title:
LTC Test- Ubuntu18.04: Starting the guest with network filter defined
will fail with "cause is unknown".
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