From: Satyam Sharma <[email protected]>
[6/9] netconsole: Update documentation for multiple target support
... and add a few useful general purpose tips as well while we're at it.
Signed-off-by: Satyam Sharma <[email protected]>
Cc: Keiichi Kii <[email protected]>
Cc: Takayoshi Kochi <[email protected]>
---
Documentation/networking/netconsole.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
---
diff -ruNp a/Documentation/networking/netconsole.txt b/Documentation/networking/netconsole.txt
--- a/Documentation/networking/netconsole.txt 2007-04-26 08:38:32.000000000 +0530
+++ b/Documentation/networking/netconsole.txt 2007-07-02 11:44:53.000000000 +0530
@@ -34,6 +34,12 @@ Examples:
insmod netconsole netconsole=@/,@10.0.0.2/
+It also supports logging to multiple remote agents by specifying
+parameters for the multiple agents separated by semicolons and the
+complete string enclosed in "quotes", thusly:
+
+modprobe netconsole netconsole="@/,@10.0.0.2/;@/eth1,[email protected]/"
+
Built-in netconsole starts immediately after the TCP stack is
initialized and attempts to bring up the supplied dev at the supplied
address.
@@ -44,6 +50,18 @@ WARNING: the default target ethernet set
ethernet address to send packets, which can cause increased load on
other systems on the same ethernet segment.
+TIP: some LAN switches may be configured to suppress ethernet broadcasts
+so it is advised to explicitly specify the remote agents' MAC addresses
+from the config parameters passed to netconsole.
+
+TIP: to find out the MAC address of 10.0.0.2, you may try using:
+ping -c 1 10.0.0.2 ; /sbin/arp -n | grep 10.0.0.2
+
+TIP: in case the remote logging agent is on a separate LAN subnet than
+the sender, it is suggested to try specifying the default gateway's
+(you may use /sbin/route -n to find out) MAC address as the remote MAC
+address instead.
+
NOTE: the network device (eth1 in the above case) can run any kind
of other network traffic, netconsole is not intrusive. Netconsole
might cause slight delays in other traffic if the volume of kernel
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