let me make comment on current git (v1.0-1172-g235fe3b), my XP SP3 -net dump is attached. You can see slirp almost not returning anything to guest (10.0.2.15), while the outgoing packets seem to be delivered correctly.
** Attachment added: "net dump from v1.0-1172-g235fe3b with XP SP3 guest" https://bugs.launchpad.net/qemu/+bug/824650/+attachment/2777445/+files/qemu-vlan0.pcap -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/824650 Title: Latest GIT assert error in arp_table.c Status in QEMU: Fix Released Bug description: The latest git version of qemu (commit 8cc7c3952d4d0a681d8d4c3ac89a206a5bfd7f00) crashes after a few minutes. All was fine up to a few days ago. This is wth both x86 and sparc emulation, on an x86_64 host. e.g. qemu-system-sparc -drive file=netbsd5.0.2-sparc,index=0,media=disk,cache=unsafe -m 256 -boot c -nographic -redir tcp:2232::22: qemu-system-sparc: slirp/arp_table.c:75: arp_table_search: Assertion `(ip_addr & (__extension__ ({ register unsigned int __v, __x = (~(0xf << 28)); if (__builtin_constant_p (__x)) __v = ((((__x) & 0xff000000) >> 24) | (((__x) & 0x00ff0000) >> 8) | (((__x) & 0x0000ff00) << 8) | (((__x) & 0x000000ff) << 24)); else __asm__ ("bswap %0" : "=r" (__v) : "0" (__x)); __v; }))) != 0' failed. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/824650/+subscriptions