Re: path MTU bug still there?

2001-01-01 Thread Jonathan Morton
On Sun, 31 Dec 2000, Alan Cox wrote: > > How is this solved? Personally, I am behind a CIPE tunnel with an MTU of > > 1442 or something like that. I experienced problems to some places and > > You have to get the other end to fix it. > > > Could it be some kind of incompability at the tunnel

Re: path MTU bug still there?

2001-01-01 Thread Jonathan Morton
On Sun, 31 Dec 2000, Alan Cox wrote: How is this solved? Personally, I am behind a CIPE tunnel with an MTU of 1442 or something like that. I experienced problems to some places and You have to get the other end to fix it. Could it be some kind of incompability at the tunnel level that

Re: path MTU bug still there?

2000-12-31 Thread Jussi Hamalainen
On Mon, 1 Jan 2001, Lincoln Dale wrote: > i know that you've said previously that you've increased your MTU beyond > 1500, but can you validate that it is actually working? Yup. At least 1500 byte ICMP echo packets get through the tunnel OK. > alternatively, ensure that your application is

Re: path MTU bug still there?

2000-12-31 Thread Lincoln Dale
Hi, At 05:28 PM 31/12/2000 +0200, Jussi Hamalainen wrote: >On Sun, 31 Dec 2000, Mikael Abrahamsson wrote: > > > When the linux box does TCP to the outside it'll use the MTU of > > the tunnel (default route is the tunnel) and thus works perfectly > > (since TCP MSS will be set low enough to fit

Re: path MTU bug still there?

2000-12-31 Thread Jussi Hamalainen
On Sun, 31 Dec 2000, Mikael Abrahamsson wrote: > When the linux box does TCP to the outside it'll use the MTU of > the tunnel (default route is the tunnel) and thus works perfectly > (since TCP MSS will be set low enough to fit into the tunnel). In my case I can't access a problematic host even

Re: path MTU bug still there?

2000-12-31 Thread Alan Cox
> How is this solved? Personally, I am behind a CIPE tunnel with an MTU of > 1442 or something like that. I experienced problems to some places and You have to get the other end to fix it. > Could it be some kind of incompability at the tunnel level that make you > unable to receive large

Re: path MTU bug still there?

2000-12-31 Thread Mikael Abrahamsson
On Sun, 31 Dec 2000, Jussi Hamalainen wrote: > I'm running 2.2.18 vanilla and my firewall rules aren't blocking > ICMP. The ethernet interfaces and the ISDN link have an MTU of > 1500 and the GRE tunnel has an MTU of 1514 (courtesy of Cisco). How is this solved? Personally, I am behind a CIPE

path MTU bug still there?

2000-12-31 Thread Jussi Hamalainen
I have an old 486-box acting as a router. It has two NICs and an ISDN adapter. The box is connected to my ISP by ISDN link and has a GRE tunnel running over the ISDN link. The other end of the tunnel is a Cisco router and the tunnel is the default route. I'm experiencing problems identical to the

path MTU bug still there?

2000-12-31 Thread Jussi Hamalainen
I have an old 486-box acting as a router. It has two NICs and an ISDN adapter. The box is connected to my ISP by ISDN link and has a GRE tunnel running over the ISDN link. The other end of the tunnel is a Cisco router and the tunnel is the default route. I'm experiencing problems identical to the

Re: path MTU bug still there?

2000-12-31 Thread Mikael Abrahamsson
On Sun, 31 Dec 2000, Jussi Hamalainen wrote: I'm running 2.2.18 vanilla and my firewall rules aren't blocking ICMP. The ethernet interfaces and the ISDN link have an MTU of 1500 and the GRE tunnel has an MTU of 1514 (courtesy of Cisco). How is this solved? Personally, I am behind a CIPE

Re: path MTU bug still there?

2000-12-31 Thread Alan Cox
How is this solved? Personally, I am behind a CIPE tunnel with an MTU of 1442 or something like that. I experienced problems to some places and You have to get the other end to fix it. Could it be some kind of incompability at the tunnel level that make you unable to receive large packets

Re: path MTU bug still there?

2000-12-31 Thread Jussi Hamalainen
On Sun, 31 Dec 2000, Mikael Abrahamsson wrote: When the linux box does TCP to the outside it'll use the MTU of the tunnel (default route is the tunnel) and thus works perfectly (since TCP MSS will be set low enough to fit into the tunnel). In my case I can't access a problematic host even

Re: path MTU bug still there?

2000-12-31 Thread Lincoln Dale
Hi, At 05:28 PM 31/12/2000 +0200, Jussi Hamalainen wrote: On Sun, 31 Dec 2000, Mikael Abrahamsson wrote: When the linux box does TCP to the outside it'll use the MTU of the tunnel (default route is the tunnel) and thus works perfectly (since TCP MSS will be set low enough to fit into the

Re: path MTU bug still there?

2000-12-31 Thread Jussi Hamalainen
On Mon, 1 Jan 2001, Lincoln Dale wrote: i know that you've said previously that you've increased your MTU beyond 1500, but can you validate that it is actually working? Yup. At least 1500 byte ICMP echo packets get through the tunnel OK. alternatively, ensure that your application is