Subject: ip4csum on wm - problems
To: None <>
From: rudolf <>
List: tech-net
Date: 03/30/2006 16:05:38

I have a problem with ip4csum on wm with NetBSD-3.0_STABLE/xen (dom0) 
(should be probably same as i386).

After "ifconfig wm0 ip4csum" and sending ICMP echo requests to this 
machine I am able to see both requests and replys with tcpdump on this 
machine, on the sending machine I see only requests. TCP4CSUM and 
UDP4CSUM work without problems, as everything else. Am I doing something 
wrong? What can I do to debug this?

The device is:
wm0 at pci2 dev 3 function 0: Intel i82541GI 1000BASE-T Ethernet, rev. 5
wm0: interrupting at irq 17, event channel 10
wm0: 32-bit 33MHz PCI bus
wm0: 256 word (8 address bits) MicroWire EEPROM
wm0: Ethernet address 00:0e:0c:6a:9f:59
igphy0 at wm0 phy 1: Intel IGP01E1000 Gigabit PHY, rev. 0
igphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
1000baseT-FDX, auto

# ifconfig wm0
mtu 1500
         address: 00:0e:0c:6a:9f:59
         media: Ethernet autoselect (100baseTX 
         status: active
         inet netmask 0xffffff00 broadcast
         inet6 fe80::20e:cff:fe6a:9f59%wm0 prefixlen 64 scopeid 0x1