Hi everyone, I noticed that in the last few days the question of the proper MTU for ADSL connections was raised, with some remarks about corrections/additions to the HOWTO . so: 1) We plan to rewrite the HOWTO, so we will take the remarks into consideration. 2) the current version of the howto has, in the section about ip masquerading, the following sentence:
MAKE SURE THAT YOU READ THE DOCUMENT IN http://damyen.technion.ac.il/~dani/adsl-mtu.txt AND THAT YOU IMPLEMENT ONE OF THE RECOMMENDATION THERE. FAILING TO DO SO WILL CAUSE CONNECTIVITY PROBLEMS FOR STATIONS IN THE MASQUERADED NETWORK. I believe that the Linux comunity can: a) read and understand that document. And remember: knowledge is power! b) implement the rccomandetions therein (even without understanding). and the recommandations are: It is recommanded that hosts in nat/routed/masqueraded environment will be set up with maximum MTU of 1460 bytes (or whatever the ppp mtu is ), and thus the advertized maxmimum segment size will be 1420 bytes. This will ensure that no atempt (during path MTU discovery) to send packets larger than the tunnel's MTU will be done. This may be acheaved with IPtables without changing the MTU of the internal station by adding a rule of TCPMSS --clump-mss-to-pmtu (see the example in the file fw-adsl.sh ). Anyway, my next lecture in Haifux (22-1-2002) will cover (and clear up ?) this topic. Reinventing the wheel is usualy somewhat frastrating ... Dani ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
