Messages in this thread |  | | Date | Sat, 2 Sep 2000 13:01:14 -0400 (EDT) | From | Gregory Maxwell <> |
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On Sat, 2 Sep 2000, Matti Aarnio wrote:
> On Sat, Sep 02, 2000 at 04:12:04PM +0200, Elmer Joandi wrote: > .... > > There is another big problem like that... > > tunnels actually do not work on todays real internet... > > MTU 1500 is so much a standard that it starts killing tunnels. > > MTU < 1500 is not a working solution today thanks to (mostly > > linux based ? ) broken firewalls > > It is due to knee-jerk ICMP blocking settings at firewalls/routers. [snip]
Yes, this is indeed the primary cause. All of the Linux howtos for firewalling appear to warn against this. Most of the time I've see this happen it's been ACLs on a Cisco router. Checkpoint makes it harder to make this mistake by having normally invisable 'ALLOW' rules for such traffic (and DNS too).
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