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[Qemu-devel] [PATCH] doc: slirp supports ICMP echo if enabled in Linux
From: |
Gernot Hillier |
Subject: |
[Qemu-devel] [PATCH] doc: slirp supports ICMP echo if enabled in Linux |
Date: |
Thu, 10 Jul 2014 16:01:25 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
Since QEMU 0.15, slirp (user mode networking) supports ping to the
Internet, see e6d43cfb1f9
Signed-off-by: Gernot Hillier <address@hidden>
---
qemu-doc.texi | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 551619a..fc6e57d 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -1205,9 +1205,17 @@ In order to check that the user mode network is
working, you can ping
the address 10.0.2.2 and verify that you got an address in the range
10.0.2.x from the QEMU virtual DHCP server.
-Note that @code{ping} is not supported reliably to the internet as it
-would require root privileges. It means you can only ping the local
-router (10.0.2.2).
+Note that ICMP traffic in general does not work with user mode networking.
address@hidden, aka. ICMP echo, to the local router (10.0.2.2) shall work,
+however. If you're using QEMU on Linux >= 3.0, it can use unprivileged ICMP
+ping sockets to allow @code{ping} to the Internet. The host admin has
to set
+the ping_group_range in order to grant access to those sockets. To
allow ping
+for the users group (GID 100):
+
address@hidden
+
+echo 100 100 > /proc/sys/net/ipv4/ping_group_range
address@hidden example
When using the built-in TFTP server, the router is also the TFTP
server.
--
1.8.4
- [Qemu-devel] [PATCH] doc: slirp supports ICMP echo if enabled in Linux,
Gernot Hillier <=