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Dennis Wehrle openbsc at wehrle.itHi > >> until here everything is OK, except that the send-function should return the >> number of bytes which are sent, but the value is always too large for three. > > so it returns less than what we wrote? > No msg->len and ret are equal. I think it was my fault. I had count the bytes manually. For example: <001b> ipaccess.c:512 TX 2: 03 01 01 28 02 03 0b 00 02 49 04 <001b> ipaccess.c:514 msg->len 14 <001b> ipaccess.c:520 bfd->fd: 12 <001b> ipaccess.c:521 ret: 14 On line 512 i count manually 15 bytes, but the msg->len and ret value is 18. I think this is OK, than the bytes on line 512 doesn't contain the IPA protocol bytes. I could verify this on wireshark. There are 3 bytes more for the IPA header (00 0b 00). So i would say that i've misinterpreted that. On line 510 the function ipaccess_prepend_header is called and therefore i thought that the bytes for the header is included at the output. I didn't concerned that only the msg->l2h is printed. > > You can set a delay timer to not things as fast as possible and probably get IPA packets into different IP packets. > Unfortunately this doesn't solve the problem. > > this is valid behavior (and you see it during RSL/OML bring up), one thing how > Ok. If this is a valid behavior, maybe i'm on the wrong track. Therefore i don't know how to investigate the problem further. > > this can break (and would break OpenBSC/libosmo-abis) is that we do: > > 1.) ipa_header = recv(3 bytes) > 2.) data = recv(ipa_header->len) > > this would fail in case header and data do not appear on the same frame. So > the esoteric question is do you have MTU changes in your network (this assumes > that the ipaccess would have similar broken code we have)? > No the standard MTU (1500 Bytes) is set. Even if i connect it directly on my pc via a switch the problem occurs. My abis pcap file was created this way. Best regards Dennis Wehrle