The kernel forcefully applies MTU values received in router advertisements provided the new MTU is less than the current. This behavior is undesirable when the user space is managing the MTU. Instead a sysctl flag 'accept_ra_mtu' is introduced such that the user space can control whether or not RA provided MTU updates should be applied. The default behavior is unchanged; user space must explicitly set this flag to 0 for RA MTUs to be ignored.
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| @@ -169,6 +169,7 @@ enum { · 168 unmodified lines | |||
| 169 | DEVCONF_SUPPRESS_FRAG_NDISC, | 169 | DEVCONF_SUPPRESS_FRAG_NDISC, |
| 170 | DEVCONF_ACCEPT_RA_FROM_LOCAL, | 170 | DEVCONF_ACCEPT_RA_FROM_LOCAL, |
| 171 | DEVCONF_USE_OPTIMISTIC, | 171 | DEVCONF_USE_OPTIMISTIC, |
| 172 | DEVCONF_ACCEPT_RA_MTU, | ||
| 172 | DEVCONF_MAX | 173 | DEVCONF_MAX |
| 173 | }; | 174 | }; |
| 174 | 175 | ||