linux losts network connection by Port Mirroring

'chris' — Mon, 30 Aug 2004 17:25:28 GMT

hi

I'd like to sniff with linux suse on the switched network.

each time when I enable Port Mirroring
on the DELL Switch PowerConnect 3024
with the newest firmware 6.1.2.3291,
then my linux SUSE 8.2 prof. server losts the connection.

knows someone what's wrong ?

# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:09:85:G2:88:9B
inet addr:192.168.0.5 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe90::209:75ff:fef3:777a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1356 Metric:1
RX packets:7876 errors:3 dropped:0 overruns:0 frame:3
TX packets:11241 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:2541136 (2.4 Mb) TX bytes:1895596 (1.8 Mb)
Interrupt:10 Base address:0xecc0 Memory:ff8e0000-ff900000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:43660 errors:0 dropped:0 overruns:0 frame:0
TX packets:43660 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2355411 (2.2 Mb) TX bytes:2355411 (2.2 Mb)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

Re: linux losts network connection by Port Mirroring

Chris Saunderson — Tue, 31 Aug 2004 08:54:33 GMT

Do you get any syslog or /var/adm/messages information regarding what happens to the port?

Re: linux losts network connection by Port Mirroring

'chris' — Tue, 31 Aug 2004 17:41:55 GMT

hi

No, I don't get any information and really
don't understand what's wrong ?

greetings
chris

Re: linux losts network connection by Port Mirroring

'chris' — Tue, 31 Aug 2004 18:10:42 GMT

hi

I think I've found the answer.

The switch is working as designed.
It disables by port mirroring any traffic to/from the destination port while replicates all traffic from the source port.

regards
chris

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linux losts network connection by Port Mirroring

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