diff options
Diffstat (limited to 'share/man/man4/gif.4')
| -rw-r--r-- | share/man/man4/gif.4 | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/share/man/man4/gif.4 b/share/man/man4/gif.4 index 2d25c69..64a3c5a 100644 --- a/share/man/man4/gif.4 +++ b/share/man/man4/gif.4 @@ -63,12 +63,13 @@ Also, administrator needs to configure protocol and addresses used for the inner header, by using .Xr ifconfig 8 . Note that IPv6 link-local address -.Pq those start with Li fe80:: +(those start with +.Li fe80:: ) will be automatically configured whenever possible. You may need to remove IPv6 link-local address manually using .Xr ifconfig 8 , when you would like to disable the use of IPv6 as inner header -.Pq like when you need pure IPv4-over-IPv6 tunnel . +(like when you need pure IPv4-over-IPv6 tunnel). Finally, use routing table to route the packets toward .Nm interface. @@ -103,20 +104,16 @@ With .Dv IFF_LINK1 , .Nm will copy ECN bits -.Po -.Dv 0x02 +.Dv ( 0x02 and .Dv 0x01 -on IPv4 TOS byte or IPv6 traffic class byte -.Pc +on IPv4 TOS byte or IPv6 traffic class byte) on egress and ingress, as follows: .Bl -tag -width "Ingress" -offset indent .It Ingress Copy TOS bits except for ECN CE -.Po -masked with -.Dv 0xfe -.Pc +(masked with +.Dv 0xfe ) from inner to outer. set ECN CE bit to @@ -181,7 +178,7 @@ For example, you cannot usually use to talk with IPsec devices that use IPsec tunnel mode. .Pp The current code does not check if the ingress address -.Pq outer source address +(outer source address) configured to .Nm makes sense. @@ -192,7 +189,7 @@ and your node will generate packets with a spoofed source address. If the outer protocol is IPv4, .Nm does not try to perform path MTU discovery for the encapsulated packet -.Pq DF bit is set to 0 . +(DF bit is set to 0). .Pp If the outer protocol is IPv6, path MTU discovery for encapsulated packet may affect communication over the interface. |
