On Tue, 10 Nov 2015 13:54:09 +0100 Phil Sutter <[email protected]> wrote: > Technically, the range of possible hoplimit values are defined by IPv4 > and IPv6 header formats. Both define the field to be eight bits in size, > which leads to a value range of [0;255]. Setting a packet's hoplimit > field to 0 though makes not much sense, as the next hop would > immediately drop the packet. Therefore Linux uses 0 as a special value > indicating to use the system's default hoplimit (configurable via > sysctl). In iproute, setting the hoplimit of a route to 0 is equivalent > to omitting the hoplimit parameter alltogether, so it is not necessary > to allow that value to be specified. > > Signed-off-by: Phil Sutter <[email protected]>
Even though it doesn't make much sense to set hoplimit of 0; I am concerned that some user is doing that now, and changing this would break a working (but not optimum or sane) configuration. Especially if actual config is auto-generated. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
