Messages in this thread | | | From | kuznet@ms2 ... | Subject | Re: IPSEC transport mode w/2.2.x kernels and large packets | Date | Sat, 7 Aug 1999 23:39:57 +0400 (MSK DST) |
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Hello!
> AX.25 IP is normally run in UI mode (datagram mode - UI being the name of the > LAPB frame used for this [Unnumbered Information]), so no. And in 'reliable' > mode the hop by hop lapb RR frames murder the link more than IP retransmits
I see. Well, are such networks used somewhere for transit?
I mean: if host attached to ax.25 advertises MTU=128 doing TCP, we need not pmtu discovery. The only case, when it is bad is AX.25 using as transit between two high MTU networks.
Seriously, Alan. I am about to disable PMTU discovery to decrease MTU under 556(512+20+20) and to fall to fragmentation instead. Well, I am not about to. I already did it. It is sysctl option, but it does not help, because big servers will not believe to PMTU discovery for clients sitting on ethernets behind AX.25 links...
Alexey
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