Sending or receiving fragmented ping packet crashes VPCs #38
Description
Sending or receiving a fragmented ping packet crashes VPCs. The console closes and does not come back up when i try to open it from the right-click menu. The VPC no longer answers to non-fragmented pings, even though it shows as started.
The first ping request is sent and captured with Wireshark, but that's the last message from the VPC.
Setup: Set MTU to 1500 on VPC and Cisco Switch.
From the VPC:
PC1> ping 10.0.1.1 -l 1472
1500 bytes from 10.0.1.1 icmp_seq=1 ttl=64 time=1.159 ms
From the VPC:
PC1> ping 10.0.1.1 -l 1473
Corrupted ...
The terminal window closes after the last message, so i couldn't capture the last line completely.
Wireshark summary, first case:
only one ping request - reply - pair is shown, multiple are recorded.
97 140.125738 10.0.1.11 10.0.1.1 ICMP 1514 Echo (ping) request id=0xa54d, seq=5/1280, ttl=64 (reply in 98)
98 140.127178 10.0.1.1 10.0.1.11 ICMP 1514 Echo (ping) reply id=0xa54d, seq=5/1280, ttl=64 (request in 97)
Wireshark summary, second case:
only one ping request - reply - pair is recorded.
31 53.586293 10.0.1.11 10.0.1.1 IPv4 1514 Fragmented IP protocol (proto=ICMP 1, off=0, ID=4f09) [Reassembled in GNS3/gns3-server#32]
32 53.586320 10.0.1.11 10.0.1.1 ICMP 35 Echo (ping) request id=0x094f, seq=1/256, ttl=64 (reply in 34)
33 53.587849 10.0.1.1 10.0.1.11 IPv4 1514 Fragmented IP protocol (proto=ICMP 1, off=0, ID=4f09) [Reassembled in GNS3/gns3-server#34]
34 53.587873 10.0.1.1 10.0.1.11 ICMP 56 Echo (ping) reply id=0x094f, seq=1/256, ttl=64 (request in 32)
GNS3 Version: 2.2.28
VPCS Version: 0.8.2
/usr/bin/vpcs -v
Welcome to Virtual PC Simulator, version 0.8.2
Dedicated to Daling.
Build time: Aug 23 2021 11:15:00
Copyright (c) 2007-2015, Paul Meng (mirnshi@gmail.com)
All rights reserved.
VPCS is free software, distributed under the terms of the "BSD" licence.
Source code and license can be found at vpcs.sf.net.
For more information, please visit wiki.freecode.com.cn.
apt show gns3-*
Package: gns3-gui
Version: 2.2.28~impish1
Priority: extra
Section: net
Maintainer: GNS3 team <developers@gns3.net>
Installed-Size: 26,8 MB
Depends: python3, python3-pyqt5, python3-pyqt5.qtsvg, python3-pyqt5.qtwebsockets, wireshark, vinagre, libc6 (>= 2.7)
Recommends: gns3-server
Replaces: gns3 (<< 1.4.0-1)
Download-Size: 6.474 kB
APT-Manual-Installed: yes
APT-Sources: http://ppa.launchpad.net/gns3/ppa/ubuntu impish/main amd64 Packages
Description: GNS3 GUI
Package: gns3-server
Version: 2.2.28~impish1
Priority: extra
Section: net
Maintainer: GNS3 team <developers@gns3.net>
Installed-Size: 48,5 MB
Depends: python3, vpcs, ubridge (>= 0.9.14), qemu-system-x86, qemu-kvm, qemu-utils, mtools, cpulimit, libvirt-bin | libvirt-daemon-system, libc6 (>= 2.14)
Recommends: dynamips, x11vnc, xvfb
Enhances: gns3-iou
Download-Size: 8.929 kB
APT-Manual-Installed: yes
APT-Sources: http://ppa.launchpad.net/gns3/ppa/ubuntu impish/main amd64 Packages
Description: GNS3 server
Package: gns3-iou
Version: 0.0.3~impish1
Priority: extra
Section: net
Maintainer: GNS3 team <developers@gns3.net>
Installed-Size: 9.216 B
Pre-Depends: dpkg (>= 1.16.1)
Depends: libssl1.0.0:i386 | libssl1.1:i386, lib32z1
Download-Size: 1.380 B
APT-Manual-Installed: yes
APT-Sources: http://ppa.launchpad.net/gns3/ppa/ubuntu impish/main amd64 Packages
Description: GNS3 support for IOU
Package: gns3-webclient-pack
Version: 1.0.0b3~impish2
Priority: optional
Section: net
Maintainer: GNS3 team <developers@gns3.net>
Bugs: https://github.com/GNS3/gns3-webclient-pack/issues
Installed-Size: 498 kB
Depends: python3, python3-pyqt5, python3-distro, telnet, vinagre, virt-viewer, wireshark, xterm | x-terminal-emulator, python3:any
Download-Size: 143 kB
APT-Sources: http://ppa.launchpad.net/gns3/ppa/ubuntu impish/main amd64 Packages
Description: GNS3 WebClient pack to use with the GNS3 web interface
This package installs all the required packages to connect to GNS3 nodes
using Telnet, VNC or SPICE and do packet captures on GNS3 links
This package provides protocol handlers for the following URL schemes:
* gns3+telnet://
* gns3+vnc://
* gns3+spice://
* gns3+pcap://
Possibly related
#7