Bug 6530

Summary: `ip ro` advmss option is not supported
Product: Busybox Reporter: ojab
Component: NetworkingAssignee: unassigned
Status: RESOLVED FIXED    
Severity: minor CC: busybox-cvs
Priority: P5    
Version: 1.21.x   
Target Milestone: ---   
Hardware: PC   
OS: Linux   
Host: Target:
Build:

Description ojab 2013-10-01 11:44:11 UTC 
From `man ip`:
>advmss NUMBER (2.3.15+ only)
>              the  MSS  ('Maximal  Segment  Size')  to advertise to these destinations when establishing TCP connections.  If it is not given, Linux uses a default value calculated from the first hop device MTU.  (If the path to these destination is asymmetric, this guess may be wrong.)

But busybox-1.21.1 (and trunk afaiu) doesn't support it:
>$busybox ip ro add default via 1.1.1.1 dev eth1 advmss 8910
>ip: either "to" is duplicate, or "advmss" is garbage
Comment 1 Denys Vlasenko 2017-04-07 15:01:31 UTC 
Fixed in git.