Packet corruption in re0

Niki Denev nike_d at cytexbg.com
Thu Feb 21 07:43:20 UTC 2008


On Thu, Feb 21, 2008 at 5:15 AM, Eric L. Chen <d9364104 at mail.nchu.edu.tw> wrote:
>
>
>  On Thu, 2008-02-21 at 11:03 +1000, Robert Backhaus wrote:
>  > I am experiencing roughly 15% packet corruption on the re interface on
>  > my freebsd 7/amd64  box.
>  >
>  > FreeBSD gw.flexi.robbak.com 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #8:
>  > Tue Feb  5 09:49:55 EST 2008
>  > root at gw.flexi.robbak.com:/usr/obj/usr/src/sys/GW  amd64
>  >
>  > The attached 3 files demonstrate the problem: "ping" shows the output
>  > of ping -c 100, and shows 15% packet loss. "tcpdump" shows the packets
>  > leaving, and some of the lost packets being returned with addresses,
>  > ports and data corrupted. The data in these packets seems to be coming
>  > from other packets passing through other interfaces at the time.
>  > "remote-tcpdump" shows the packets being received and returned from
>  > the other machine. Note that some packets are being corrupted on the
>  > way out, too.
>  >
>  > Just to make troubleshooting difficult, this problem only shows up
>  > after the system has been up for roughly 36 hours, depending on the
>  > amount of traffic.
>  >
>  > I am using the latest bios that I am aware of. The bios that I
>  > recently applied did include a firmware update for the realtek
>  > interface, but this did not affect the problem.
>  > _______________________________________________
>
>  I disabled some hw features and works fine.
>  like this (/etc/rc.conf)
>  ifconfig_re0="inet 192.168.1.10  netmask 255.255.255.0 -rxcsum -txcsum
>  -tso -lr
>  o"
>
>  /Eric
>

I experienced the same problems shortly after upgrading to 7.0-PRE
After about a day and something of uptime my ssh shells began to drop
with messages about corrupted/mismatched checksums.
I "fixed" the problem by putting an em(4) interface in the machine,
because I need it to be online and accessible remotely at all times.

  --Niki


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