Bug 75221

Summary:	CONFIG_PROC_SYSCTL is required for networking
Product:	Networking	Reporter:	Stefan de Konink (stefan)
Component:	Other	Assignee:	Stephen Hemminger (stephen)
Status:	NEW ---
Severity:	normal	CC:	romieu, szg00000
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.14.2	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Move local port range init

Description Stefan de Konink 2014-05-01 10:17:24 UTC

I am in the proces of building an embedded kernel which I wanted to limit in both functionality and memory. For this reason I disabled CONFIG_PROC_SYSCTL. I have figured out the hard way that this functionality implements the successful randomisation of source ports, it might be responsible for the initialisation of net.ipv4.ip_local_port_range.

Effectively, booting a kernel with ip=dhcp works. Ping-pong (ICMP) to and from an address works. DNS queries (UDP/53) don't because the source port remains 0, a connection to a typical webserver also seems to result in a no reply situation.

Comment 1 Francois Romieu 2014-05-01 20:25:24 UTC

Created attachment 134641 [details]
Move local port range init

Comment 2 Francois Romieu 2014-05-04 21:26:00 UTC

Stephan, does it work for you ?

-- 
Ueimor

Comment 3 Stefan de Konink 2014-05-04 21:40:32 UTC

Tested-by: Stefan de Konink <stefan@konink.de>

I have just tested the patch. Without /proc/sys present, networking works now. Thanks!