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Re: How to create IP-IP tunnel between FreeBSD and Linux

Felipe Alfaro Solana — Thu, 04 Dec 2008 08:40:42 -0000

Using an MTU of 1,500 on the tun0 will likely cause fragmentation issues.

Typically, Ethernet maximum frame size is 1,500 bytes. MTU reflects the maximum payload that will fit in the Layer 2 without causing fragmentation. If you use an MTU of 1,500 for tun0, your encapsulating IP datagram will likely be fragmented because you are not accounting for the overhead of the encapsulation.

When using IP-over-IP, you need to discount 20 bytes for the encapsulating IP header. This means you should use an MTU of 1,480 and not 1,500. If you want to use GRE, you also need to deduct the size of the GRE header.

Re: How to create IP-IP tunnel between FreeBSD and Linux

Алексей — Fri, 19 Oct 2007 06:58:14 -0000

можно и нужно :)

Re: How to create IP-IP tunnel between FreeBSD and Linux

Семён — Thu, 09 Aug 2007 05:11:27 -0000

Народ а расскажите можно ли теперь этот IP-тунель криптовать Racoon-ом???

Re: How to create IP-IP tunnel between FreeBSD and Linux

jr — Thu, 17 May 2007 11:26:31 -0000

Very good, I've tested just the linux part and it works fine.
MAny Thanks

Re: How to create IP-IP tunnel between FreeBSD and Linux

tunnel — Wed, 24 Jan 2007 20:47:18 -0000

In 5.x and 6.x the gifconfig command is included in the ifconfig command itself as an option "tunnel".

Re: How to create IP-IP tunnel between FreeBSD and Linux

Scoundrel — Thu, 27 Jul 2006 10:31:11 -0000

I've tried it in 4.X, but I think, that this command should be in 5.X and 6.X. maybe they've changed its name... Try to use Google ;-)

Re: How to create IP-IP tunnel between FreeBSD and Linux

rcayenne — Thu, 27 Jul 2006 03:39:04 -0000

For which version of FreeBSD is this example intented? I tryed it on 5.2.1 and there is no gifconfig command.

Re: How to create IP-IP tunnel between FreeBSD and Linux

zenith — Fri, 09 Jun 2006 11:42:43 -0000

У меня вот возник вопрос: как быть если число серверов больше двух? Настраивать туннели попарно? Или можно это сделать по-другому? У меня 14 подсетей :)

Re: How to create IP-IP tunnel between FreeBSD and Linux

Thomas Anderson — Tue, 06 Jun 2006 03:26:53 -0000

# ifconfig tun0 10.0.0.1 netmask 255.255.255.252 \
> pointopoint 10.0.0.1

ошибочка - должно быть так:
ifconfig tun0 10.0.0.1 netmask 255.255.255.252 \
> pointopoint 10.0.0.2